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2to3.html
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__future__.html
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__main__.html
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abc.html
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aifc.html
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allos.html
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archiving.html
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argparse.html
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array.html
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ast.html
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asynchat.html
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asyncio-dev.html
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asyncio-eventloop.html
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asyncio-protocol.html
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asyncio-queue.html
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asyncio-stream.html
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asyncio-subprocess.html
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asyncio-sync.html
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asyncio-task.html
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asyncio.html
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asyncore.html
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atexit.html
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audioop.html
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base64.html
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bdb.html
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binary.html
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binascii.html
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bisect.html
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builtins.html
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bz2.html
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calendar.html
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cgi.html
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cgitb.html
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cmath.html
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cmd.html
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code.html
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codecs.html
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codeop.html
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collections.abc.html
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collections.html
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colorsys.html
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compileall.html
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concurrency.html
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concurrent.futures.html
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concurrent.html
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configparser.html
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constants.html
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contextlib.html
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copy.html
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crypt.html
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crypto.html
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csv.html
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ctypes.html
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curses.ascii.html
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datatypes.html
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datetime.html
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dbm.html
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debug.html
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development.html
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difflib.html
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dis.html
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distribution.html
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distutils.html
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doctest.html
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dummy_threading.html
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email.charset.html
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email.compat32-message.html
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email.contentmanager.html
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email.errors.html
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email.examples.html
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email.generator.html
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email.header.html
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email.headerregistry.html
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email.html
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email.iterators.html
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email.message.html
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email.mime.html
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email.parser.html
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email.policy.html
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email.util.html
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ensurepip.html
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enum.html
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errno.html
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exceptions.html
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faulthandler.html
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fcntl.html
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filecmp.html
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fileformats.html
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fileinput.html
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filesys.html
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fnmatch.html
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formatter.html
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fpectl.html
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fractions.html
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frameworks.html
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ftplib.html
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functional.html
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functions.html
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functools.html
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gc.html
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getopt.html
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getpass.html
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gettext.html
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glob.html
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grp.html
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gzip.html
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hashlib.html
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heapq.html
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hmac.html
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html.entities.html
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html.html
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html.parser.html
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i18n.html
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idle.html
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imp.html
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importlib.html
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index.html
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inspect.html
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keyword.html
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locale.html
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lzma.html
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macpath.html
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mailbox.html
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marshal.html
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math.html
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mimetypes.html
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misc.html
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modules.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>29.9. traceback — Print or retrieve a stack traceback — Python 3.6.7 documentation</title> <link rel="stylesheet" href="../_static/pydoctheme.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript" id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 3.6.7 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="29.10. __future__ — Future statement definitions" href="__future__.html" /> <link rel="prev" title="29.8. atexit — Exit handlers" href="atexit.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/library/traceback.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="__future__.html" title="29.10. __future__ — Future statement definitions" accesskey="N">next</a> |</li> <li class="right" > <a href="atexit.html" title="29.8. atexit — Exit handlers" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="python.html" accesskey="U">29. Python Runtime Services</a> »</li> <li class="right"> <div class="inline-search" style="display: none" role="search"> <form class="inline-search" action="../search.html" method="get"> <input placeholder="Quick search" type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> </div> <script type="text/javascript">$('.inline-search').show(0);</script> | </li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <div class="section" id="module-traceback"> <span id="traceback-print-or-retrieve-a-stack-traceback"></span><h1>29.9. <a class="reference internal" href="#module-traceback" title="traceback: Print or retrieve a stack traceback."><code class="xref py py-mod docutils literal notranslate"><span class="pre">traceback</span></code></a> — Print or retrieve a stack traceback<a class="headerlink" href="#module-traceback" title="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.6/Lib/traceback.py">Lib/traceback.py</a></p> <hr class="docutils" /> <p>This module provides a standard interface to extract, format and print stack traces of Python programs. It exactly mimics the behavior of the Python interpreter when it prints a stack trace. This is useful when you want to print stack traces under program control, such as in a “wrapper” around the interpreter.</p> <p id="index-0">The module uses traceback objects — this is the object type that is stored in the <a class="reference internal" href="sys.html#sys.last_traceback" title="sys.last_traceback"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.last_traceback</span></code></a> variable and returned as the third item from <a class="reference internal" href="sys.html#sys.exc_info" title="sys.exc_info"><code class="xref py py-func docutils literal notranslate"><span class="pre">sys.exc_info()</span></code></a>.</p> <p>The module defines the following functions:</p> <dl class="function"> <dt id="traceback.print_tb"> <code class="descclassname">traceback.</code><code class="descname">print_tb</code><span class="sig-paren">(</span><em>tb</em>, <em>limit=None</em>, <em>file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.print_tb" title="Permalink to this definition">¶</a></dt> <dd><p>Print up to <em>limit</em> stack trace entries from traceback object <em>tb</em> (starting from the caller’s frame) if <em>limit</em> is positive. Otherwise, print the last <code class="docutils literal notranslate"><span class="pre">abs(limit)</span></code> entries. If <em>limit</em> is omitted or <code class="docutils literal notranslate"><span class="pre">None</span></code>, all entries are printed. If <em>file</em> is omitted or <code class="docutils literal notranslate"><span class="pre">None</span></code>, the output goes to <code class="docutils literal notranslate"><span class="pre">sys.stderr</span></code>; otherwise it should be an open file or file-like object to receive the output.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.5: </span>Added negative <em>limit</em> support.</p> </div> </dd></dl> <dl class="function"> <dt id="traceback.print_exception"> <code class="descclassname">traceback.</code><code class="descname">print_exception</code><span class="sig-paren">(</span><em>etype</em>, <em>value</em>, <em>tb</em>, <em>limit=None</em>, <em>file=None</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.print_exception" title="Permalink to this definition">¶</a></dt> <dd><p>Print exception information and stack trace entries from traceback object <em>tb</em> to <em>file</em>. This differs from <a class="reference internal" href="#traceback.print_tb" title="traceback.print_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_tb()</span></code></a> in the following ways:</p> <ul class="simple"> <li>if <em>tb</em> is not <code class="docutils literal notranslate"><span class="pre">None</span></code>, it prints a header <code class="docutils literal notranslate"><span class="pre">Traceback</span> <span class="pre">(most</span> <span class="pre">recent</span> <span class="pre">call</span> <span class="pre">last):</span></code></li> <li>it prints the exception <em>etype</em> and <em>value</em> after the stack trace</li> <li>if <em>type(value)</em> is <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a> and <em>value</em> has the appropriate format, it prints the line where the syntax error occurred with a caret indicating the approximate position of the error.</li> </ul> <p>The optional <em>limit</em> argument has the same meaning as for <a class="reference internal" href="#traceback.print_tb" title="traceback.print_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_tb()</span></code></a>. If <em>chain</em> is true (the default), then chained exceptions (the <code class="xref py py-attr docutils literal notranslate"><span class="pre">__cause__</span></code> or <code class="xref py py-attr docutils literal notranslate"><span class="pre">__context__</span></code> attributes of the exception) will be printed as well, like the interpreter itself does when printing an unhandled exception.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.5: </span>The <em>etype</em> argument is ignored and inferred from the type of <em>value</em>.</p> </div> </dd></dl> <dl class="function"> <dt id="traceback.print_exc"> <code class="descclassname">traceback.</code><code class="descname">print_exc</code><span class="sig-paren">(</span><em>limit=None</em>, <em>file=None</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.print_exc" title="Permalink to this definition">¶</a></dt> <dd><p>This is a shorthand for <code class="docutils literal notranslate"><span class="pre">print_exception(*sys.exc_info(),</span> <span class="pre">limit,</span> <span class="pre">file,</span> <span class="pre">chain)</span></code>.</p> </dd></dl> <dl class="function"> <dt id="traceback.print_last"> <code class="descclassname">traceback.</code><code class="descname">print_last</code><span class="sig-paren">(</span><em>limit=None</em>, <em>file=None</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.print_last" title="Permalink to this definition">¶</a></dt> <dd><p>This is a shorthand for <code class="docutils literal notranslate"><span class="pre">print_exception(sys.last_type,</span> <span class="pre">sys.last_value,</span> <span class="pre">sys.last_traceback,</span> <span class="pre">limit,</span> <span class="pre">file,</span> <span class="pre">chain)</span></code>. In general it will work only after an exception has reached an interactive prompt (see <a class="reference internal" href="sys.html#sys.last_type" title="sys.last_type"><code class="xref py py-data docutils literal notranslate"><span class="pre">sys.last_type</span></code></a>).</p> </dd></dl> <dl class="function"> <dt id="traceback.print_stack"> <code class="descclassname">traceback.</code><code class="descname">print_stack</code><span class="sig-paren">(</span><em>f=None</em>, <em>limit=None</em>, <em>file=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.print_stack" title="Permalink to this definition">¶</a></dt> <dd><p>Print up to <em>limit</em> stack trace entries (starting from the invocation point) if <em>limit</em> is positive. Otherwise, print the last <code class="docutils literal notranslate"><span class="pre">abs(limit)</span></code> entries. If <em>limit</em> is omitted or <code class="docutils literal notranslate"><span class="pre">None</span></code>, all entries are printed. The optional <em>f</em> argument can be used to specify an alternate stack frame to start. The optional <em>file</em> argument has the same meaning as for <a class="reference internal" href="#traceback.print_tb" title="traceback.print_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_tb()</span></code></a>.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.5: </span>Added negative <em>limit</em> support.</p> </div> </dd></dl> <dl class="function"> <dt id="traceback.extract_tb"> <code class="descclassname">traceback.</code><code class="descname">extract_tb</code><span class="sig-paren">(</span><em>tb</em>, <em>limit=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.extract_tb" title="Permalink to this definition">¶</a></dt> <dd><p>Return a <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> object representing a list of “pre-processed” stack trace entries extracted from the traceback object <em>tb</em>. It is useful for alternate formatting of stack traces. The optional <em>limit</em> argument has the same meaning as for <a class="reference internal" href="#traceback.print_tb" title="traceback.print_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_tb()</span></code></a>. A “pre-processed” stack trace entry is a <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> object containing attributes <code class="xref py py-attr docutils literal notranslate"><span class="pre">filename</span></code>, <code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code>, <code class="xref py py-attr docutils literal notranslate"><span class="pre">name</span></code>, and <code class="xref py py-attr docutils literal notranslate"><span class="pre">line</span></code> representing the information that is usually printed for a stack trace. The <code class="xref py py-attr docutils literal notranslate"><span class="pre">line</span></code> is a string with leading and trailing whitespace stripped; if the source is not available it is <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> <dl class="function"> <dt id="traceback.extract_stack"> <code class="descclassname">traceback.</code><code class="descname">extract_stack</code><span class="sig-paren">(</span><em>f=None</em>, <em>limit=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.extract_stack" title="Permalink to this definition">¶</a></dt> <dd><p>Extract the raw traceback from the current stack frame. The return value has the same format as for <a class="reference internal" href="#traceback.extract_tb" title="traceback.extract_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">extract_tb()</span></code></a>. The optional <em>f</em> and <em>limit</em> arguments have the same meaning as for <a class="reference internal" href="#traceback.print_stack" title="traceback.print_stack"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_stack()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="traceback.format_list"> <code class="descclassname">traceback.</code><code class="descname">format_list</code><span class="sig-paren">(</span><em>extracted_list</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_list" title="Permalink to this definition">¶</a></dt> <dd><p>Given a list of tuples or <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> objects as returned by <a class="reference internal" href="#traceback.extract_tb" title="traceback.extract_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">extract_tb()</span></code></a> or <a class="reference internal" href="#traceback.extract_stack" title="traceback.extract_stack"><code class="xref py py-func docutils literal notranslate"><span class="pre">extract_stack()</span></code></a>, return a list of strings ready for printing. Each string in the resulting list corresponds to the item with the same index in the argument list. Each string ends in a newline; the strings may contain internal newlines as well, for those items whose source text line is not <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> </dd></dl> <dl class="function"> <dt id="traceback.format_exception_only"> <code class="descclassname">traceback.</code><code class="descname">format_exception_only</code><span class="sig-paren">(</span><em>etype</em>, <em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_exception_only" title="Permalink to this definition">¶</a></dt> <dd><p>Format the exception part of a traceback. The arguments are the exception type and value such as given by <code class="docutils literal notranslate"><span class="pre">sys.last_type</span></code> and <code class="docutils literal notranslate"><span class="pre">sys.last_value</span></code>. The return value is a list of strings, each ending in a newline. Normally, the list contains a single string; however, for <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a> exceptions, it contains several lines that (when printed) display detailed information about where the syntax error occurred. The message indicating which exception occurred is the always last string in the list.</p> </dd></dl> <dl class="function"> <dt id="traceback.format_exception"> <code class="descclassname">traceback.</code><code class="descname">format_exception</code><span class="sig-paren">(</span><em>etype</em>, <em>value</em>, <em>tb</em>, <em>limit=None</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_exception" title="Permalink to this definition">¶</a></dt> <dd><p>Format a stack trace and the exception information. The arguments have the same meaning as the corresponding arguments to <a class="reference internal" href="#traceback.print_exception" title="traceback.print_exception"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_exception()</span></code></a>. The return value is a list of strings, each ending in a newline and some containing internal newlines. When these lines are concatenated and printed, exactly the same text is printed as does <a class="reference internal" href="#traceback.print_exception" title="traceback.print_exception"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_exception()</span></code></a>.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.5: </span>The <em>etype</em> argument is ignored and inferred from the type of <em>value</em>.</p> </div> </dd></dl> <dl class="function"> <dt id="traceback.format_exc"> <code class="descclassname">traceback.</code><code class="descname">format_exc</code><span class="sig-paren">(</span><em>limit=None</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_exc" title="Permalink to this definition">¶</a></dt> <dd><p>This is like <code class="docutils literal notranslate"><span class="pre">print_exc(limit)</span></code> but returns a string instead of printing to a file.</p> </dd></dl> <dl class="function"> <dt id="traceback.format_tb"> <code class="descclassname">traceback.</code><code class="descname">format_tb</code><span class="sig-paren">(</span><em>tb</em>, <em>limit=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_tb" title="Permalink to this definition">¶</a></dt> <dd><p>A shorthand for <code class="docutils literal notranslate"><span class="pre">format_list(extract_tb(tb,</span> <span class="pre">limit))</span></code>.</p> </dd></dl> <dl class="function"> <dt id="traceback.format_stack"> <code class="descclassname">traceback.</code><code class="descname">format_stack</code><span class="sig-paren">(</span><em>f=None</em>, <em>limit=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.format_stack" title="Permalink to this definition">¶</a></dt> <dd><p>A shorthand for <code class="docutils literal notranslate"><span class="pre">format_list(extract_stack(f,</span> <span class="pre">limit))</span></code>.</p> </dd></dl> <dl class="function"> <dt id="traceback.clear_frames"> <code class="descclassname">traceback.</code><code class="descname">clear_frames</code><span class="sig-paren">(</span><em>tb</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.clear_frames" title="Permalink to this definition">¶</a></dt> <dd><p>Clears the local variables of all the stack frames in a traceback <em>tb</em> by calling the <code class="xref py py-meth docutils literal notranslate"><span class="pre">clear()</span></code> method of each frame object.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 3.4.</span></p> </div> </dd></dl> <dl class="function"> <dt id="traceback.walk_stack"> <code class="descclassname">traceback.</code><code class="descname">walk_stack</code><span class="sig-paren">(</span><em>f</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.walk_stack" title="Permalink to this definition">¶</a></dt> <dd><p>Walk a stack following <code class="docutils literal notranslate"><span class="pre">f.f_back</span></code> from the given frame, yielding the frame and line number for each frame. If <em>f</em> is <code class="docutils literal notranslate"><span class="pre">None</span></code>, the current stack is used. This helper is used with <a class="reference internal" href="#traceback.StackSummary.extract" title="traceback.StackSummary.extract"><code class="xref py py-meth docutils literal notranslate"><span class="pre">StackSummary.extract()</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> </dd></dl> <dl class="function"> <dt id="traceback.walk_tb"> <code class="descclassname">traceback.</code><code class="descname">walk_tb</code><span class="sig-paren">(</span><em>tb</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.walk_tb" title="Permalink to this definition">¶</a></dt> <dd><p>Walk a traceback following <code class="docutils literal notranslate"><span class="pre">tb_next</span></code> yielding the frame and line number for each frame. This helper is used with <a class="reference internal" href="#traceback.StackSummary.extract" title="traceback.StackSummary.extract"><code class="xref py py-meth docutils literal notranslate"><span class="pre">StackSummary.extract()</span></code></a>.</p> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> </dd></dl> <p>The module also defines the following classes:</p> <div class="section" id="tracebackexception-objects"> <h2>29.9.1. <a class="reference internal" href="#traceback.TracebackException" title="traceback.TracebackException"><code class="xref py py-class docutils literal notranslate"><span class="pre">TracebackException</span></code></a> Objects<a class="headerlink" href="#tracebackexception-objects" title="Permalink to this headline">¶</a></h2> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> <p><a class="reference internal" href="#traceback.TracebackException" title="traceback.TracebackException"><code class="xref py py-class docutils literal notranslate"><span class="pre">TracebackException</span></code></a> objects are created from actual exceptions to capture data for later printing in a lightweight fashion.</p> <dl class="class"> <dt id="traceback.TracebackException"> <em class="property">class </em><code class="descclassname">traceback.</code><code class="descname">TracebackException</code><span class="sig-paren">(</span><em>exc_type</em>, <em>exc_value</em>, <em>exc_traceback</em>, <em>*</em>, <em>limit=None</em>, <em>lookup_lines=True</em>, <em>capture_locals=False</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.TracebackException" title="Permalink to this definition">¶</a></dt> <dd><p>Capture an exception for later rendering. <em>limit</em>, <em>lookup_lines</em> and <em>capture_locals</em> are as for the <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> class.</p> <p>Note that when locals are captured, they are also shown in the traceback.</p> <dl class="attribute"> <dt id="traceback.TracebackException.__cause__"> <code class="descname">__cause__</code><a class="headerlink" href="#traceback.TracebackException.__cause__" title="Permalink to this definition">¶</a></dt> <dd><p>A <a class="reference internal" href="#traceback.TracebackException" title="traceback.TracebackException"><code class="xref py py-class docutils literal notranslate"><span class="pre">TracebackException</span></code></a> of the original <code class="docutils literal notranslate"><span class="pre">__cause__</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.__context__"> <code class="descname">__context__</code><a class="headerlink" href="#traceback.TracebackException.__context__" title="Permalink to this definition">¶</a></dt> <dd><p>A <a class="reference internal" href="#traceback.TracebackException" title="traceback.TracebackException"><code class="xref py py-class docutils literal notranslate"><span class="pre">TracebackException</span></code></a> of the original <code class="docutils literal notranslate"><span class="pre">__context__</span></code>.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.__suppress_context__"> <code class="descname">__suppress_context__</code><a class="headerlink" href="#traceback.TracebackException.__suppress_context__" title="Permalink to this definition">¶</a></dt> <dd><p>The <code class="docutils literal notranslate"><span class="pre">__suppress_context__</span></code> value from the original exception.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.stack"> <code class="descname">stack</code><a class="headerlink" href="#traceback.TracebackException.stack" title="Permalink to this definition">¶</a></dt> <dd><p>A <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> representing the traceback.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.exc_type"> <code class="descname">exc_type</code><a class="headerlink" href="#traceback.TracebackException.exc_type" title="Permalink to this definition">¶</a></dt> <dd><p>The class of the original traceback.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.filename"> <code class="descname">filename</code><a class="headerlink" href="#traceback.TracebackException.filename" title="Permalink to this definition">¶</a></dt> <dd><p>For syntax errors - the file name where the error occurred.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.lineno"> <code class="descname">lineno</code><a class="headerlink" href="#traceback.TracebackException.lineno" title="Permalink to this definition">¶</a></dt> <dd><p>For syntax errors - the line number where the error occurred.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.text"> <code class="descname">text</code><a class="headerlink" href="#traceback.TracebackException.text" title="Permalink to this definition">¶</a></dt> <dd><p>For syntax errors - the text where the error occurred.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.offset"> <code class="descname">offset</code><a class="headerlink" href="#traceback.TracebackException.offset" title="Permalink to this definition">¶</a></dt> <dd><p>For syntax errors - the offset into the text where the error occurred.</p> </dd></dl> <dl class="attribute"> <dt id="traceback.TracebackException.msg"> <code class="descname">msg</code><a class="headerlink" href="#traceback.TracebackException.msg" title="Permalink to this definition">¶</a></dt> <dd><p>For syntax errors - the compiler error message.</p> </dd></dl> <dl class="classmethod"> <dt id="traceback.TracebackException.from_exception"> <em class="property">classmethod </em><code class="descname">from_exception</code><span class="sig-paren">(</span><em>exc</em>, <em>*</em>, <em>limit=None</em>, <em>lookup_lines=True</em>, <em>capture_locals=False</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.TracebackException.from_exception" title="Permalink to this definition">¶</a></dt> <dd><p>Capture an exception for later rendering. <em>limit</em>, <em>lookup_lines</em> and <em>capture_locals</em> are as for the <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> class.</p> <p>Note that when locals are captured, they are also shown in the traceback.</p> </dd></dl> <dl class="method"> <dt id="traceback.TracebackException.format"> <code class="descname">format</code><span class="sig-paren">(</span><em>*</em>, <em>chain=True</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.TracebackException.format" title="Permalink to this definition">¶</a></dt> <dd><p>Format the exception.</p> <p>If <em>chain</em> is not <code class="docutils literal notranslate"><span class="pre">True</span></code>, <code class="docutils literal notranslate"><span class="pre">__cause__</span></code> and <code class="docutils literal notranslate"><span class="pre">__context__</span></code> will not be formatted.</p> <p>The return value is a generator of strings, each ending in a newline and some containing internal newlines. <a class="reference internal" href="#traceback.print_exception" title="traceback.print_exception"><code class="xref py py-func docutils literal notranslate"><span class="pre">print_exception()</span></code></a> is a wrapper around this method which just prints the lines to a file.</p> <p>The message indicating which exception occurred is always the last string in the output.</p> </dd></dl> <dl class="method"> <dt id="traceback.TracebackException.format_exception_only"> <code class="descname">format_exception_only</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#traceback.TracebackException.format_exception_only" title="Permalink to this definition">¶</a></dt> <dd><p>Format the exception part of the traceback.</p> <p>The return value is a generator of strings, each ending in a newline.</p> <p>Normally, the generator emits a single string; however, for <a class="reference internal" href="exceptions.html#SyntaxError" title="SyntaxError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">SyntaxError</span></code></a> exceptions, it emits several lines that (when printed) display detailed information about where the syntax error occurred.</p> <p>The message indicating which exception occurred is always the last string in the output.</p> </dd></dl> </dd></dl> </div> <div class="section" id="stacksummary-objects"> <h2>29.9.2. <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> Objects<a class="headerlink" href="#stacksummary-objects" title="Permalink to this headline">¶</a></h2> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> <p><a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> objects represent a call stack ready for formatting.</p> <dl class="class"> <dt id="traceback.StackSummary"> <em class="property">class </em><code class="descclassname">traceback.</code><code class="descname">StackSummary</code><a class="headerlink" href="#traceback.StackSummary" title="Permalink to this definition">¶</a></dt> <dd><dl class="classmethod"> <dt id="traceback.StackSummary.extract"> <em class="property">classmethod </em><code class="descname">extract</code><span class="sig-paren">(</span><em>frame_gen</em>, <em>*</em>, <em>limit=None</em>, <em>lookup_lines=True</em>, <em>capture_locals=False</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.StackSummary.extract" title="Permalink to this definition">¶</a></dt> <dd><p>Construct a <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> object from a frame generator (such as is returned by <a class="reference internal" href="#traceback.walk_stack" title="traceback.walk_stack"><code class="xref py py-func docutils literal notranslate"><span class="pre">walk_stack()</span></code></a> or <a class="reference internal" href="#traceback.walk_tb" title="traceback.walk_tb"><code class="xref py py-func docutils literal notranslate"><span class="pre">walk_tb()</span></code></a>).</p> <p>If <em>limit</em> is supplied, only this many frames are taken from <em>frame_gen</em>. If <em>lookup_lines</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code>, the returned <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> objects will not have read their lines in yet, making the cost of creating the <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> cheaper (which may be valuable if it may not actually get formatted). If <em>capture_locals</em> is <code class="docutils literal notranslate"><span class="pre">True</span></code> the local variables in each <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> are captured as object representations.</p> </dd></dl> <dl class="classmethod"> <dt id="traceback.StackSummary.from_list"> <em class="property">classmethod </em><code class="descname">from_list</code><span class="sig-paren">(</span><em>a_list</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.StackSummary.from_list" title="Permalink to this definition">¶</a></dt> <dd><p>Construct a <a class="reference internal" href="#traceback.StackSummary" title="traceback.StackSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">StackSummary</span></code></a> object from a supplied list of <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> objects or old-style list of tuples. Each tuple should be a 4-tuple with filename, lineno, name, line as the elements.</p> </dd></dl> <dl class="method"> <dt id="traceback.StackSummary.format"> <code class="descname">format</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#traceback.StackSummary.format" title="Permalink to this definition">¶</a></dt> <dd><p>Returns a list of strings ready for printing. Each string in the resulting list corresponds to a single frame from the stack. Each string ends in a newline; the strings may contain internal newlines as well, for those items with source text lines.</p> <p>For long sequences of the same frame and line, the first few repetitions are shown, followed by a summary line stating the exact number of further repetitions.</p> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.6: </span>Long sequences of repeated frames are now abbreviated.</p> </div> </dd></dl> </dd></dl> </div> <div class="section" id="framesummary-objects"> <h2>29.9.3. <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> Objects<a class="headerlink" href="#framesummary-objects" title="Permalink to this headline">¶</a></h2> <div class="versionadded"> <p><span class="versionmodified">New in version 3.5.</span></p> </div> <p><a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> objects represent a single frame in a traceback.</p> <dl class="class"> <dt id="traceback.FrameSummary"> <em class="property">class </em><code class="descclassname">traceback.</code><code class="descname">FrameSummary</code><span class="sig-paren">(</span><em>filename</em>, <em>lineno</em>, <em>name</em>, <em>lookup_line=True</em>, <em>locals=None</em>, <em>line=None</em><span class="sig-paren">)</span><a class="headerlink" href="#traceback.FrameSummary" title="Permalink to this definition">¶</a></dt> <dd><p>Represent a single frame in the traceback or stack that is being formatted or printed. It may optionally have a stringified version of the frames locals included in it. If <em>lookup_line</em> is <code class="docutils literal notranslate"><span class="pre">False</span></code>, the source code is not looked up until the <a class="reference internal" href="#traceback.FrameSummary" title="traceback.FrameSummary"><code class="xref py py-class docutils literal notranslate"><span class="pre">FrameSummary</span></code></a> has the <code class="xref py py-attr docutils literal notranslate"><span class="pre">line</span></code> attribute accessed (which also happens when casting it to a tuple). <code class="xref py py-attr docutils literal notranslate"><span class="pre">line</span></code> may be directly provided, and will prevent line lookups happening at all. <em>locals</em> is an optional local variable dictionary, and if supplied the variable representations are stored in the summary for later display.</p> </dd></dl> </div> <div class="section" id="traceback-examples"> <span id="traceback-example"></span><h2>29.9.4. Traceback Examples<a class="headerlink" href="#traceback-examples" title="Permalink to this headline">¶</a></h2> <p>This simple example implements a basic read-eval-print loop, similar to (but less useful than) the standard Python interactive interpreter loop. For a more complete implementation of the interpreter loop, refer to the <a class="reference internal" href="code.html#module-code" title="code: Facilities to implement read-eval-print loops."><code class="xref py py-mod docutils literal notranslate"><span class="pre">code</span></code></a> module.</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">sys</span><span class="o">,</span> <span class="nn">traceback</span> <span class="k">def</span> <span class="nf">run_user_code</span><span class="p">(</span><span class="n">envdir</span><span class="p">):</span> <span class="n">source</span> <span class="o">=</span> <span class="nb">input</span><span class="p">(</span><span class="s2">">>> "</span><span class="p">)</span> <span class="k">try</span><span class="p">:</span> <span class="n">exec</span><span class="p">(</span><span class="n">source</span><span class="p">,</span> <span class="n">envdir</span><span class="p">)</span> <span class="k">except</span> <span class="ne">Exception</span><span class="p">:</span> <span class="nb">print</span><span class="p">(</span><span class="s2">"Exception in user code:"</span><span class="p">)</span> <span class="nb">print</span><span class="p">(</span><span class="s2">"-"</span><span class="o">*</span><span class="mi">60</span><span class="p">)</span> <span class="n">traceback</span><span class="o">.</span><span class="n">print_exc</span><span class="p">(</span><span class="n">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="p">)</span> <span class="nb">print</span><span class="p">(</span><span class="s2">"-"</span><span class="o">*</span><span class="mi">60</span><span class="p">)</span> <span class="n">envdir</span> <span class="o">=</span> <span class="p">{}</span> <span class="k">while</span> <span class="kc">True</span><span class="p">:</span> <span class="n">run_user_code</span><span class="p">(</span><span class="n">envdir</span><span class="p">)</span> </pre></div> </div> <p>The following example demonstrates the different ways to print and format the exception and traceback:</p> <div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">sys</span><span class="o">,</span> <span class="nn">traceback</span> <span class="k">def</span> <span class="nf">lumberjack</span><span class="p">():</span> <span class="n">bright_side_of_death</span><span class="p">()</span> <span class="k">def</span> <span class="nf">bright_side_of_death</span><span class="p">():</span> <span class="k">return</span> <span class="nb">tuple</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span> <span class="k">try</span><span class="p">:</span> <span class="n">lumberjack</span><span class="p">()</span> <span class="k">except</span> <span class="ne">IndexError</span><span class="p">:</span> <span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">exc_traceback</span> <span class="o">=</span> <span class="n">sys</span><span class="o">.</span><span class="n">exc_info</span><span class="p">()</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** print_tb:"</span><span class="p">)</span> <span class="n">traceback</span><span class="o">.</span><span class="n">print_tb</span><span class="p">(</span><span class="n">exc_traceback</span><span class="p">,</span> <span class="n">limit</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="nb">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="p">)</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** print_exception:"</span><span class="p">)</span> <span class="c1"># exc_type below is ignored on 3.5 and later</span> <span class="n">traceback</span><span class="o">.</span><span class="n">print_exception</span><span class="p">(</span><span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">exc_traceback</span><span class="p">,</span> <span class="n">limit</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="nb">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="p">)</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** print_exc:"</span><span class="p">)</span> <span class="n">traceback</span><span class="o">.</span><span class="n">print_exc</span><span class="p">(</span><span class="n">limit</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="nb">file</span><span class="o">=</span><span class="n">sys</span><span class="o">.</span><span class="n">stdout</span><span class="p">)</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** format_exc, first and last line:"</span><span class="p">)</span> <span class="n">formatted_lines</span> <span class="o">=</span> <span class="n">traceback</span><span class="o">.</span><span class="n">format_exc</span><span class="p">()</span><span class="o">.</span><span class="n">splitlines</span><span class="p">()</span> <span class="k">print</span><span class="p">(</span><span class="n">formatted_lines</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span> <span class="k">print</span><span class="p">(</span><span class="n">formatted_lines</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">])</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** format_exception:"</span><span class="p">)</span> <span class="c1"># exc_type below is ignored on 3.5 and later</span> <span class="k">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_exception</span><span class="p">(</span><span class="n">exc_type</span><span class="p">,</span> <span class="n">exc_value</span><span class="p">,</span> <span class="n">exc_traceback</span><span class="p">)))</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** extract_tb:"</span><span class="p">)</span> <span class="k">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">extract_tb</span><span class="p">(</span><span class="n">exc_traceback</span><span class="p">)))</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** format_tb:"</span><span class="p">)</span> <span class="k">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_tb</span><span class="p">(</span><span class="n">exc_traceback</span><span class="p">)))</span> <span class="k">print</span><span class="p">(</span><span class="s2">"*** tb_lineno:"</span><span class="p">,</span> <span class="n">exc_traceback</span><span class="o">.</span><span class="n">tb_lineno</span><span class="p">)</span> </pre></div> </div> <p>The output for the example would look similar to this:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>*** print_tb: File "<doctest...>", line 10, in <module> lumberjack() *** print_exception: Traceback (most recent call last): File "<doctest...>", line 10, in <module> lumberjack() File "<doctest...>", line 4, in lumberjack bright_side_of_death() IndexError: tuple index out of range *** print_exc: Traceback (most recent call last): File "<doctest...>", line 10, in <module> lumberjack() File "<doctest...>", line 4, in lumberjack bright_side_of_death() IndexError: tuple index out of range *** format_exc, first and last line: Traceback (most recent call last): IndexError: tuple index out of range *** format_exception: ['Traceback (most recent call last):\n', ' File "<doctest...>", line 10, in <module>\n lumberjack()\n', ' File "<doctest...>", line 4, in lumberjack\n bright_side_of_death()\n', ' File "<doctest...>", line 7, in bright_side_of_death\n return tuple()[0]\n', 'IndexError: tuple index out of range\n'] *** extract_tb: [<FrameSummary file <doctest...>, line 10 in <module>>, <FrameSummary file <doctest...>, line 4 in lumberjack>, <FrameSummary file <doctest...>, line 7 in bright_side_of_death>] *** format_tb: [' File "<doctest...>", line 10, in <module>\n lumberjack()\n', ' File "<doctest...>", line 4, in lumberjack\n bright_side_of_death()\n', ' File "<doctest...>", line 7, in bright_side_of_death\n return tuple()[0]\n'] *** tb_lineno: 10 </pre></div> </div> <p>The following example shows the different ways to print and format the stack:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">traceback</span> <span class="gp">>>> </span><span class="k">def</span> <span class="nf">another_function</span><span class="p">():</span> <span class="gp">... </span> <span class="n">lumberstack</span><span class="p">()</span> <span class="gp">...</span> <span class="gp">>>> </span><span class="k">def</span> <span class="nf">lumberstack</span><span class="p">():</span> <span class="gp">... </span> <span class="n">traceback</span><span class="o">.</span><span class="n">print_stack</span><span class="p">()</span> <span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">extract_stack</span><span class="p">()))</span> <span class="gp">... </span> <span class="nb">print</span><span class="p">(</span><span class="nb">repr</span><span class="p">(</span><span class="n">traceback</span><span class="o">.</span><span class="n">format_stack</span><span class="p">()))</span> <span class="gp">...</span> <span class="gp">>>> </span><span class="n">another_function</span><span class="p">()</span> <span class="go"> File "<doctest>", line 10, in <module></span> <span class="go"> another_function()</span> <span class="go"> File "<doctest>", line 3, in another_function</span> <span class="go"> lumberstack()</span> <span class="go"> File "<doctest>", line 6, in lumberstack</span> <span class="go"> traceback.print_stack()</span> <span class="go">[('<doctest>', 10, '<module>', 'another_function()'),</span> <span class="go"> ('<doctest>', 3, 'another_function', 'lumberstack()'),</span> <span class="go"> ('<doctest>', 7, 'lumberstack', 'print(repr(traceback.extract_stack()))')]</span> <span class="go">[' File "<doctest>", line 10, in <module>\n another_function()\n',</span> <span class="go"> ' File "<doctest>", line 3, in another_function\n lumberstack()\n',</span> <span class="go"> ' File "<doctest>", line 8, in lumberstack\n print(repr(traceback.format_stack()))\n']</span> </pre></div> </div> <p>This last example demonstrates the final few formatting functions:</p> <div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">traceback</span> <span class="gp">>>> </span><span class="n">traceback</span><span class="o">.</span><span class="n">format_list</span><span class="p">([(</span><span class="s1">'spam.py'</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="s1">'<module>'</span><span class="p">,</span> <span class="s1">'spam.eggs()'</span><span class="p">),</span> <span class="gp">... </span> <span class="p">(</span><span class="s1">'eggs.py'</span><span class="p">,</span> <span class="mi">42</span><span class="p">,</span> <span class="s1">'eggs'</span><span class="p">,</span> <span class="s1">'return "bacon"'</span><span class="p">)])</span> <span class="go">[' File "spam.py", line 3, in <module>\n spam.eggs()\n',</span> <span class="go"> ' File "eggs.py", line 42, in eggs\n return "bacon"\n']</span> <span class="gp">>>> </span><span class="n">an_error</span> <span class="o">=</span> <span class="ne">IndexError</span><span class="p">(</span><span class="s1">'tuple index out of range'</span><span class="p">)</span> <span class="gp">>>> </span><span class="n">traceback</span><span class="o">.</span><span class="n">format_exception_only</span><span class="p">(</span><span class="nb">type</span><span class="p">(</span><span class="n">an_error</span><span class="p">),</span> <span class="n">an_error</span><span class="p">)</span> <span class="go">['IndexError: tuple index out of range\n']</span> </pre></div> </div> </div> </div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h3><a href="../contents.html">Table Of Contents</a></h3> <ul> <li><a class="reference internal" href="#">29.9. <code class="docutils literal notranslate"><span class="pre">traceback</span></code> — Print or retrieve a stack traceback</a><ul> <li><a class="reference internal" href="#tracebackexception-objects">29.9.1. <code class="docutils literal notranslate"><span class="pre">TracebackException</span></code> Objects</a></li> <li><a class="reference internal" href="#stacksummary-objects">29.9.2. <code class="docutils literal notranslate"><span class="pre">StackSummary</span></code> Objects</a></li> <li><a class="reference internal" href="#framesummary-objects">29.9.3. <code class="docutils literal notranslate"><span class="pre">FrameSummary</span></code> Objects</a></li> <li><a class="reference internal" href="#traceback-examples">29.9.4. Traceback Examples</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="atexit.html" title="previous chapter">29.8. <code class="docutils literal notranslate"><span class="pre">atexit</span></code> — Exit handlers</a></p> <h4>Next topic</h4> <p class="topless"><a href="__future__.html" title="next chapter">29.10. <code class="docutils literal notranslate"><span class="pre">__future__</span></code> — Future statement definitions</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li> <a href="https://github.com/python/cpython/blob/3.6/Doc/library/traceback.rst" rel="nofollow">Show Source </a> </li> </ul> </div> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="__future__.html" title="29.10. __future__ — Future statement definitions" >next</a> |</li> <li class="right" > <a href="atexit.html" title="29.8. atexit — Exit handlers" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">3.6.7 Documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="python.html" >29. 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