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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>32.2. ast — Abstract Syntax Trees — 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="32.3. symtable — Access to the compiler’s symbol tables" href="symtable.html" /> <link rel="prev" title="32.1. parser — Access Python parse trees" href="parser.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="https://docs.python.org/3/library/ast.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="symtable.html" title="32.3. symtable — Access to the compiler’s symbol tables" accesskey="N">next</a> |</li> <li class="right" > <a href="parser.html" title="32.1. parser — Access Python parse trees" 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="language.html" accesskey="U">32. Python Language 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-ast"> <span id="ast-abstract-syntax-trees"></span><h1>32.2. <a class="reference internal" href="#module-ast" title="ast: Abstract Syntax Tree classes and manipulation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ast</span></code></a> — Abstract Syntax Trees<a class="headerlink" href="#module-ast" 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/ast.py">Lib/ast.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-ast" title="ast: Abstract Syntax Tree classes and manipulation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ast</span></code></a> module helps Python applications to process trees of the Python abstract syntax grammar. The abstract syntax itself might change with each Python release; this module helps to find out programmatically what the current grammar looks like.</p> <p>An abstract syntax tree can be generated by passing <code class="xref py py-data docutils literal notranslate"><span class="pre">ast.PyCF_ONLY_AST</span></code> as a flag to the <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a> built-in function, or using the <a class="reference internal" href="#ast.parse" title="ast.parse"><code class="xref py py-func docutils literal notranslate"><span class="pre">parse()</span></code></a> helper provided in this module. The result will be a tree of objects whose classes all inherit from <a class="reference internal" href="#ast.AST" title="ast.AST"><code class="xref py py-class docutils literal notranslate"><span class="pre">ast.AST</span></code></a>. An abstract syntax tree can be compiled into a Python code object using the built-in <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a> function.</p> <div class="section" id="node-classes"> <h2>32.2.1. Node classes<a class="headerlink" href="#node-classes" title="Permalink to this headline">¶</a></h2> <dl class="class"> <dt id="ast.AST"> <em class="property">class </em><code class="descclassname">ast.</code><code class="descname">AST</code><a class="headerlink" href="#ast.AST" title="Permalink to this definition">¶</a></dt> <dd><p>This is the base of all AST node classes. The actual node classes are derived from the <code class="file docutils literal notranslate"><span class="pre">Parser/Python.asdl</span></code> file, which is reproduced <a class="reference internal" href="#abstract-grammar"><span class="std std-ref">below</span></a>. They are defined in the <code class="xref py py-mod docutils literal notranslate"><span class="pre">_ast</span></code> C module and re-exported in <a class="reference internal" href="#module-ast" title="ast: Abstract Syntax Tree classes and manipulation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ast</span></code></a>.</p> <p>There is one class defined for each left-hand side symbol in the abstract grammar (for example, <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.stmt</span></code> or <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.expr</span></code>). In addition, there is one class defined for each constructor on the right-hand side; these classes inherit from the classes for the left-hand side trees. For example, <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.BinOp</span></code> inherits from <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.expr</span></code>. For production rules with alternatives (aka “sums”), the left-hand side class is abstract: only instances of specific constructor nodes are ever created.</p> <dl class="attribute"> <dt id="ast.AST._fields"> <code class="descname">_fields</code><a class="headerlink" href="#ast.AST._fields" title="Permalink to this definition">¶</a></dt> <dd><p>Each concrete class has an attribute <a class="reference internal" href="#ast.AST._fields" title="ast.AST._fields"><code class="xref py py-attr docutils literal notranslate"><span class="pre">_fields</span></code></a> which gives the names of all child nodes.</p> <p>Each instance of a concrete class has one attribute for each child node, of the type as defined in the grammar. For example, <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.BinOp</span></code> instances have an attribute <code class="xref py py-attr docutils literal notranslate"><span class="pre">left</span></code> of type <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.expr</span></code>.</p> <p>If these attributes are marked as optional in the grammar (using a question mark), the value might be <code class="docutils literal notranslate"><span class="pre">None</span></code>. If the attributes can have zero-or-more values (marked with an asterisk), the values are represented as Python lists. All possible attributes must be present and have valid values when compiling an AST with <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>.</p> </dd></dl> <dl class="attribute"> <dt id="ast.AST.lineno"> <code class="descname">lineno</code><a class="headerlink" href="#ast.AST.lineno" title="Permalink to this definition">¶</a></dt> <dt id="ast.AST.col_offset"> <code class="descname">col_offset</code><a class="headerlink" href="#ast.AST.col_offset" title="Permalink to this definition">¶</a></dt> <dd><p>Instances of <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.expr</span></code> and <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.stmt</span></code> subclasses have <a class="reference internal" href="#ast.AST.lineno" title="ast.AST.lineno"><code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code></a> and <a class="reference internal" href="#ast.AST.col_offset" title="ast.AST.col_offset"><code class="xref py py-attr docutils literal notranslate"><span class="pre">col_offset</span></code></a> attributes. The <a class="reference internal" href="#ast.AST.lineno" title="ast.AST.lineno"><code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code></a> is the line number of source text (1-indexed so the first line is line 1) and the <a class="reference internal" href="#ast.AST.col_offset" title="ast.AST.col_offset"><code class="xref py py-attr docutils literal notranslate"><span class="pre">col_offset</span></code></a> is the UTF-8 byte offset of the first token that generated the node. The UTF-8 offset is recorded because the parser uses UTF-8 internally.</p> </dd></dl> <p>The constructor of a class <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.T</span></code> parses its arguments as follows:</p> <ul class="simple"> <li>If there are positional arguments, there must be as many as there are items in <code class="xref py py-attr docutils literal notranslate"><span class="pre">T._fields</span></code>; they will be assigned as attributes of these names.</li> <li>If there are keyword arguments, they will set the attributes of the same names to the given values.</li> </ul> <p>For example, to create and populate an <code class="xref py py-class docutils literal notranslate"><span class="pre">ast.UnaryOp</span></code> node, you could use</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">node</span> <span class="o">=</span> <span class="n">ast</span><span class="o">.</span><span class="n">UnaryOp</span><span class="p">()</span> <span class="n">node</span><span class="o">.</span><span class="n">op</span> <span class="o">=</span> <span class="n">ast</span><span class="o">.</span><span class="n">USub</span><span class="p">()</span> <span class="n">node</span><span class="o">.</span><span class="n">operand</span> <span class="o">=</span> <span class="n">ast</span><span class="o">.</span><span class="n">Num</span><span class="p">()</span> <span class="n">node</span><span class="o">.</span><span class="n">operand</span><span class="o">.</span><span class="n">n</span> <span class="o">=</span> <span class="mi">5</span> <span class="n">node</span><span class="o">.</span><span class="n">operand</span><span class="o">.</span><span class="n">lineno</span> <span class="o">=</span> <span class="mi">0</span> <span class="n">node</span><span class="o">.</span><span class="n">operand</span><span class="o">.</span><span class="n">col_offset</span> <span class="o">=</span> <span class="mi">0</span> <span class="n">node</span><span class="o">.</span><span class="n">lineno</span> <span class="o">=</span> <span class="mi">0</span> <span class="n">node</span><span class="o">.</span><span class="n">col_offset</span> <span class="o">=</span> <span class="mi">0</span> </pre></div> </div> <p>or the more compact</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">node</span> <span class="o">=</span> <span class="n">ast</span><span class="o">.</span><span class="n">UnaryOp</span><span class="p">(</span><span class="n">ast</span><span class="o">.</span><span class="n">USub</span><span class="p">(),</span> <span class="n">ast</span><span class="o">.</span><span class="n">Num</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span> <span class="n">lineno</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">col_offset</span><span class="o">=</span><span class="mi">0</span><span class="p">),</span> <span class="n">lineno</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">col_offset</span><span class="o">=</span><span class="mi">0</span><span class="p">)</span> </pre></div> </div> </dd></dl> </div> <div class="section" id="abstract-grammar"> <span id="id1"></span><h2>32.2.2. Abstract Grammar<a class="headerlink" href="#abstract-grammar" title="Permalink to this headline">¶</a></h2> <p>The abstract grammar is currently defined as follows:</p> <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>-- ASDL's 7 builtin types are: -- identifier, int, string, bytes, object, singleton, constant -- -- singleton: None, True or False -- constant can be None, whereas None means "no value" for object. module Python { mod = Module(stmt* body) | Interactive(stmt* body) | Expression(expr body) -- not really an actual node but useful in Jython's typesystem. | Suite(stmt* body) stmt = FunctionDef(identifier name, arguments args, stmt* body, expr* decorator_list, expr? returns) | AsyncFunctionDef(identifier name, arguments args, stmt* body, expr* decorator_list, expr? returns) | ClassDef(identifier name, expr* bases, keyword* keywords, stmt* body, expr* decorator_list) | Return(expr? value) | Delete(expr* targets) | Assign(expr* targets, expr value) | AugAssign(expr target, operator op, expr value) -- 'simple' indicates that we annotate simple name without parens | AnnAssign(expr target, expr annotation, expr? value, int simple) -- use 'orelse' because else is a keyword in target languages | For(expr target, expr iter, stmt* body, stmt* orelse) | AsyncFor(expr target, expr iter, stmt* body, stmt* orelse) | While(expr test, stmt* body, stmt* orelse) | If(expr test, stmt* body, stmt* orelse) | With(withitem* items, stmt* body) | AsyncWith(withitem* items, stmt* body) | Raise(expr? exc, expr? cause) | Try(stmt* body, excepthandler* handlers, stmt* orelse, stmt* finalbody) | Assert(expr test, expr? msg) | Import(alias* names) | ImportFrom(identifier? module, alias* names, int? level) | Global(identifier* names) | Nonlocal(identifier* names) | Expr(expr value) | Pass | Break | Continue -- XXX Jython will be different -- col_offset is the byte offset in the utf8 string the parser uses attributes (int lineno, int col_offset) -- BoolOp() can use left & right? expr = BoolOp(boolop op, expr* values) | BinOp(expr left, operator op, expr right) | UnaryOp(unaryop op, expr operand) | Lambda(arguments args, expr body) | IfExp(expr test, expr body, expr orelse) | Dict(expr* keys, expr* values) | Set(expr* elts) | ListComp(expr elt, comprehension* generators) | SetComp(expr elt, comprehension* generators) | DictComp(expr key, expr value, comprehension* generators) | GeneratorExp(expr elt, comprehension* generators) -- the grammar constrains where yield expressions can occur | Await(expr value) | Yield(expr? value) | YieldFrom(expr value) -- need sequences for compare to distinguish between -- x < 4 < 3 and (x < 4) < 3 | Compare(expr left, cmpop* ops, expr* comparators) | Call(expr func, expr* args, keyword* keywords) | Num(object n) -- a number as a PyObject. | Str(string s) -- need to specify raw, unicode, etc? | FormattedValue(expr value, int? conversion, expr? format_spec) | JoinedStr(expr* values) | Bytes(bytes s) | NameConstant(singleton value) | Ellipsis | Constant(constant value) -- the following expression can appear in assignment context | Attribute(expr value, identifier attr, expr_context ctx) | Subscript(expr value, slice slice, expr_context ctx) | Starred(expr value, expr_context ctx) | Name(identifier id, expr_context ctx) | List(expr* elts, expr_context ctx) | Tuple(expr* elts, expr_context ctx) -- col_offset is the byte offset in the utf8 string the parser uses attributes (int lineno, int col_offset) expr_context = Load | Store | Del | AugLoad | AugStore | Param slice = Slice(expr? lower, expr? upper, expr? step) | ExtSlice(slice* dims) | Index(expr value) boolop = And | Or operator = Add | Sub | Mult | MatMult | Div | Mod | Pow | LShift | RShift | BitOr | BitXor | BitAnd | FloorDiv unaryop = Invert | Not | UAdd | USub cmpop = Eq | NotEq | Lt | LtE | Gt | GtE | Is | IsNot | In | NotIn comprehension = (expr target, expr iter, expr* ifs, int is_async) excepthandler = ExceptHandler(expr? type, identifier? name, stmt* body) attributes (int lineno, int col_offset) arguments = (arg* args, arg? vararg, arg* kwonlyargs, expr* kw_defaults, arg? kwarg, expr* defaults) arg = (identifier arg, expr? annotation) attributes (int lineno, int col_offset) -- keyword arguments supplied to call (NULL identifier for **kwargs) keyword = (identifier? arg, expr value) -- import name with optional 'as' alias. alias = (identifier name, identifier? asname) withitem = (expr context_expr, expr? optional_vars) } </pre></div> </div> </div> <div class="section" id="ast-helpers"> <h2>32.2.3. <a class="reference internal" href="#module-ast" title="ast: Abstract Syntax Tree classes and manipulation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ast</span></code></a> Helpers<a class="headerlink" href="#ast-helpers" title="Permalink to this headline">¶</a></h2> <p>Apart from the node classes, the <a class="reference internal" href="#module-ast" title="ast: Abstract Syntax Tree classes and manipulation."><code class="xref py py-mod docutils literal notranslate"><span class="pre">ast</span></code></a> module defines these utility functions and classes for traversing abstract syntax trees:</p> <dl class="function"> <dt id="ast.parse"> <code class="descclassname">ast.</code><code class="descname">parse</code><span class="sig-paren">(</span><em>source</em>, <em>filename='<unknown>'</em>, <em>mode='exec'</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.parse" title="Permalink to this definition">¶</a></dt> <dd><p>Parse the source into an AST node. Equivalent to <code class="docutils literal notranslate"><span class="pre">compile(source,</span> <span class="pre">filename,</span> <span class="pre">mode,</span> <span class="pre">ast.PyCF_ONLY_AST)</span></code>.</p> <div class="admonition warning"> <p class="first admonition-title">Warning</p> <p class="last">It is possible to crash the Python interpreter with a sufficiently large/complex string due to stack depth limitations in Python’s AST compiler.</p> </div> </dd></dl> <dl class="function"> <dt id="ast.literal_eval"> <code class="descclassname">ast.</code><code class="descname">literal_eval</code><span class="sig-paren">(</span><em>node_or_string</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.literal_eval" title="Permalink to this definition">¶</a></dt> <dd><p>Safely evaluate an expression node or a string containing a Python literal or container display. The string or node provided may only consist of the following Python literal structures: strings, bytes, numbers, tuples, lists, dicts, sets, booleans, and <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> <p>This can be used for safely evaluating strings containing Python values from untrusted sources without the need to parse the values oneself. It is not capable of evaluating arbitrarily complex expressions, for example involving operators or indexing.</p> <div class="admonition warning"> <p class="first admonition-title">Warning</p> <p class="last">It is possible to crash the Python interpreter with a sufficiently large/complex string due to stack depth limitations in Python’s AST compiler.</p> </div> <div class="versionchanged"> <p><span class="versionmodified">Changed in version 3.2: </span>Now allows bytes and set literals.</p> </div> </dd></dl> <dl class="function"> <dt id="ast.get_docstring"> <code class="descclassname">ast.</code><code class="descname">get_docstring</code><span class="sig-paren">(</span><em>node</em>, <em>clean=True</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.get_docstring" title="Permalink to this definition">¶</a></dt> <dd><p>Return the docstring of the given <em>node</em> (which must be a <code class="xref py py-class docutils literal notranslate"><span class="pre">FunctionDef</span></code>, <code class="xref py py-class docutils literal notranslate"><span class="pre">ClassDef</span></code> or <code class="xref py py-class docutils literal notranslate"><span class="pre">Module</span></code> node), or <code class="docutils literal notranslate"><span class="pre">None</span></code> if it has no docstring. If <em>clean</em> is true, clean up the docstring’s indentation with <a class="reference internal" href="inspect.html#inspect.cleandoc" title="inspect.cleandoc"><code class="xref py py-func docutils literal notranslate"><span class="pre">inspect.cleandoc()</span></code></a>.</p> </dd></dl> <dl class="function"> <dt id="ast.fix_missing_locations"> <code class="descclassname">ast.</code><code class="descname">fix_missing_locations</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.fix_missing_locations" title="Permalink to this definition">¶</a></dt> <dd><p>When you compile a node tree with <a class="reference internal" href="functions.html#compile" title="compile"><code class="xref py py-func docutils literal notranslate"><span class="pre">compile()</span></code></a>, the compiler expects <code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">col_offset</span></code> attributes for every node that supports them. This is rather tedious to fill in for generated nodes, so this helper adds these attributes recursively where not already set, by setting them to the values of the parent node. It works recursively starting at <em>node</em>.</p> </dd></dl> <dl class="function"> <dt id="ast.increment_lineno"> <code class="descclassname">ast.</code><code class="descname">increment_lineno</code><span class="sig-paren">(</span><em>node</em>, <em>n=1</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.increment_lineno" title="Permalink to this definition">¶</a></dt> <dd><p>Increment the line number of each node in the tree starting at <em>node</em> by <em>n</em>. This is useful to “move code” to a different location in a file.</p> </dd></dl> <dl class="function"> <dt id="ast.copy_location"> <code class="descclassname">ast.</code><code class="descname">copy_location</code><span class="sig-paren">(</span><em>new_node</em>, <em>old_node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.copy_location" title="Permalink to this definition">¶</a></dt> <dd><p>Copy source location (<code class="xref py py-attr docutils literal notranslate"><span class="pre">lineno</span></code> and <code class="xref py py-attr docutils literal notranslate"><span class="pre">col_offset</span></code>) from <em>old_node</em> to <em>new_node</em> if possible, and return <em>new_node</em>.</p> </dd></dl> <dl class="function"> <dt id="ast.iter_fields"> <code class="descclassname">ast.</code><code class="descname">iter_fields</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.iter_fields" title="Permalink to this definition">¶</a></dt> <dd><p>Yield a tuple of <code class="docutils literal notranslate"><span class="pre">(fieldname,</span> <span class="pre">value)</span></code> for each field in <code class="docutils literal notranslate"><span class="pre">node._fields</span></code> that is present on <em>node</em>.</p> </dd></dl> <dl class="function"> <dt id="ast.iter_child_nodes"> <code class="descclassname">ast.</code><code class="descname">iter_child_nodes</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.iter_child_nodes" title="Permalink to this definition">¶</a></dt> <dd><p>Yield all direct child nodes of <em>node</em>, that is, all fields that are nodes and all items of fields that are lists of nodes.</p> </dd></dl> <dl class="function"> <dt id="ast.walk"> <code class="descclassname">ast.</code><code class="descname">walk</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.walk" title="Permalink to this definition">¶</a></dt> <dd><p>Recursively yield all descendant nodes in the tree starting at <em>node</em> (including <em>node</em> itself), in no specified order. This is useful if you only want to modify nodes in place and don’t care about the context.</p> </dd></dl> <dl class="class"> <dt id="ast.NodeVisitor"> <em class="property">class </em><code class="descclassname">ast.</code><code class="descname">NodeVisitor</code><a class="headerlink" href="#ast.NodeVisitor" title="Permalink to this definition">¶</a></dt> <dd><p>A node visitor base class that walks the abstract syntax tree and calls a visitor function for every node found. This function may return a value which is forwarded by the <a class="reference internal" href="#ast.NodeVisitor.visit" title="ast.NodeVisitor.visit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">visit()</span></code></a> method.</p> <p>This class is meant to be subclassed, with the subclass adding visitor methods.</p> <dl class="method"> <dt id="ast.NodeVisitor.visit"> <code class="descname">visit</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.NodeVisitor.visit" title="Permalink to this definition">¶</a></dt> <dd><p>Visit a node. The default implementation calls the method called <code class="samp docutils literal notranslate"><span class="pre">self.visit_</span><em><span class="pre">classname</span></em></code> where <em>classname</em> is the name of the node class, or <a class="reference internal" href="#ast.NodeVisitor.generic_visit" title="ast.NodeVisitor.generic_visit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">generic_visit()</span></code></a> if that method doesn’t exist.</p> </dd></dl> <dl class="method"> <dt id="ast.NodeVisitor.generic_visit"> <code class="descname">generic_visit</code><span class="sig-paren">(</span><em>node</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.NodeVisitor.generic_visit" title="Permalink to this definition">¶</a></dt> <dd><p>This visitor calls <a class="reference internal" href="#ast.NodeVisitor.visit" title="ast.NodeVisitor.visit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">visit()</span></code></a> on all children of the node.</p> <p>Note that child nodes of nodes that have a custom visitor method won’t be visited unless the visitor calls <a class="reference internal" href="#ast.NodeVisitor.generic_visit" title="ast.NodeVisitor.generic_visit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">generic_visit()</span></code></a> or visits them itself.</p> </dd></dl> <p>Don’t use the <a class="reference internal" href="#ast.NodeVisitor" title="ast.NodeVisitor"><code class="xref py py-class docutils literal notranslate"><span class="pre">NodeVisitor</span></code></a> if you want to apply changes to nodes during traversal. For this a special visitor exists (<a class="reference internal" href="#ast.NodeTransformer" title="ast.NodeTransformer"><code class="xref py py-class docutils literal notranslate"><span class="pre">NodeTransformer</span></code></a>) that allows modifications.</p> </dd></dl> <dl class="class"> <dt id="ast.NodeTransformer"> <em class="property">class </em><code class="descclassname">ast.</code><code class="descname">NodeTransformer</code><a class="headerlink" href="#ast.NodeTransformer" title="Permalink to this definition">¶</a></dt> <dd><p>A <a class="reference internal" href="#ast.NodeVisitor" title="ast.NodeVisitor"><code class="xref py py-class docutils literal notranslate"><span class="pre">NodeVisitor</span></code></a> subclass that walks the abstract syntax tree and allows modification of nodes.</p> <p>The <a class="reference internal" href="#ast.NodeTransformer" title="ast.NodeTransformer"><code class="xref py py-class docutils literal notranslate"><span class="pre">NodeTransformer</span></code></a> will walk the AST and use the return value of the visitor methods to replace or remove the old node. If the return value of the visitor method is <code class="docutils literal notranslate"><span class="pre">None</span></code>, the node will be removed from its location, otherwise it is replaced with the return value. The return value may be the original node in which case no replacement takes place.</p> <p>Here is an example transformer that rewrites all occurrences of name lookups (<code class="docutils literal notranslate"><span class="pre">foo</span></code>) to <code class="docutils literal notranslate"><span class="pre">data['foo']</span></code>:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="k">class</span> <span class="nc">RewriteName</span><span class="p">(</span><span class="n">NodeTransformer</span><span class="p">):</span> <span class="k">def</span> <span class="nf">visit_Name</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">node</span><span class="p">):</span> <span class="k">return</span> <span class="n">copy_location</span><span class="p">(</span><span class="n">Subscript</span><span class="p">(</span> <span class="n">value</span><span class="o">=</span><span class="n">Name</span><span class="p">(</span><span class="nb">id</span><span class="o">=</span><span class="s1">'data'</span><span class="p">,</span> <span class="n">ctx</span><span class="o">=</span><span class="n">Load</span><span class="p">()),</span> <span class="nb">slice</span><span class="o">=</span><span class="n">Index</span><span class="p">(</span><span class="n">value</span><span class="o">=</span><span class="n">Str</span><span class="p">(</span><span class="n">s</span><span class="o">=</span><span class="n">node</span><span class="o">.</span><span class="n">id</span><span class="p">)),</span> <span class="n">ctx</span><span class="o">=</span><span class="n">node</span><span class="o">.</span><span class="n">ctx</span> <span class="p">),</span> <span class="n">node</span><span class="p">)</span> </pre></div> </div> <p>Keep in mind that if the node you’re operating on has child nodes you must either transform the child nodes yourself or call the <code class="xref py py-meth docutils literal notranslate"><span class="pre">generic_visit()</span></code> method for the node first.</p> <p>For nodes that were part of a collection of statements (that applies to all statement nodes), the visitor may also return a list of nodes rather than just a single node.</p> <p>Usually you use the transformer like this:</p> <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">node</span> <span class="o">=</span> <span class="n">YourTransformer</span><span class="p">()</span><span class="o">.</span><span class="n">visit</span><span class="p">(</span><span class="n">node</span><span class="p">)</span> </pre></div> </div> </dd></dl> <dl class="function"> <dt id="ast.dump"> <code class="descclassname">ast.</code><code class="descname">dump</code><span class="sig-paren">(</span><em>node</em>, <em>annotate_fields=True</em>, <em>include_attributes=False</em><span class="sig-paren">)</span><a class="headerlink" href="#ast.dump" title="Permalink to this definition">¶</a></dt> <dd><p>Return a formatted dump of the tree in <em>node</em>. This is mainly useful for debugging purposes. The returned string will show the names and the values for fields. This makes the code impossible to evaluate, so if evaluation is wanted <em>annotate_fields</em> must be set to <code class="docutils literal notranslate"><span class="pre">False</span></code>. Attributes such as line numbers and column offsets are not dumped by default. If this is wanted, <em>include_attributes</em> can be set to <code class="docutils literal notranslate"><span class="pre">True</span></code>.</p> </dd></dl> <div class="admonition seealso"> <p class="first admonition-title">See also</p> <p class="last"><a class="reference external" href="https://greentreesnakes.readthedocs.org/">Green Tree Snakes</a>, an external documentation resource, has good details on working with Python ASTs.</p> </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="#">32.2. <code class="docutils literal notranslate"><span class="pre">ast</span></code> — Abstract Syntax Trees</a><ul> <li><a class="reference internal" href="#node-classes">32.2.1. Node classes</a></li> <li><a class="reference internal" href="#abstract-grammar">32.2.2. Abstract Grammar</a></li> <li><a class="reference internal" href="#ast-helpers">32.2.3. <code class="docutils literal notranslate"><span class="pre">ast</span></code> Helpers</a></li> </ul> </li> </ul> <h4>Previous topic</h4> <p class="topless"><a href="parser.html" title="previous chapter">32.1. <code class="docutils literal notranslate"><span class="pre">parser</span></code> — Access Python parse trees</a></p> <h4>Next topic</h4> <p class="topless"><a href="symtable.html" title="next chapter">32.3. <code class="docutils literal notranslate"><span class="pre">symtable</span></code> — Access to the compiler’s symbol tables</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/ast.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="symtable.html" title="32.3. symtable — Access to the compiler’s symbol tables" >next</a> |</li> <li class="right" > <a href="parser.html" title="32.1. parser — Access Python parse trees" >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="language.html" >32. 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