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Rename

.. highlightlang:: c

.. _fileobjects:

File Objects
------------

.. index:: object: file

These APIs are a minimal emulation of the Python 2 C API for built-in file
objects, which used to rely on the buffered I/O (:c:type:`FILE\*`) support
from the C standard library.  In Python 3, files and streams use the new
:mod:`io` module, which defines several layers over the low-level unbuffered
I/O of the operating system.  The functions described below are
convenience C wrappers over these new APIs, and meant mostly for internal
error reporting in the interpreter; third-party code is advised to access
the :mod:`io` APIs instead.

.. c:function:: PyFile_FromFd(int fd, const char *name, const char *mode, int buffering, const char *encoding, const char *errors, const char *newline, int closefd)

Create a Python file object from the file descriptor of an already
   opened file *fd*.  The arguments *name*, *encoding*, *errors* and *newline*
   can be *NULL* to use the defaults; *buffering* can be *-1* to use the
   default. *name* is ignored and kept for backward compatibility. Return
   *NULL* on failure. For a more comprehensive description of the arguments,
   please refer to the :func:`io.open` function documentation.

.. warning::

Since Python streams have their own buffering layer, mixing them with
     OS-level file descriptors can produce various issues (such as unexpected
     ordering of data).

.. versionchanged:: 3.2
      Ignore *name* attribute.

.. c:function:: int PyObject_AsFileDescriptor(PyObject *p)

Return the file descriptor associated with *p* as an :c:type:`int`.  If the
   object is an integer, its value is returned.  If not, the
   object's :meth:`~io.IOBase.fileno` method is called if it exists; the
   method must return an integer, which is returned as the file descriptor
   value.  Sets an exception and returns ``-1`` on failure.

.. c:function:: PyObject* PyFile_GetLine(PyObject *p, int n)

.. index:: single: EOFError (built-in exception)

Equivalent to ``p.readline([n])``, this function reads one line from the
   object *p*.  *p* may be a file object or any object with a
   :meth:`~io.IOBase.readline`
   method.  If *n* is ``0``, exactly one line is read, regardless of the length of
   the line.  If *n* is greater than ``0``, no more than *n* bytes will be read
   from the file; a partial line can be returned.  In both cases, an empty string
   is returned if the end of the file is reached immediately.  If *n* is less than
   ``0``, however, one line is read regardless of length, but :exc:`EOFError` is
   raised if the end of the file is reached immediately.

.. c:function:: int PyFile_WriteObject(PyObject *obj, PyObject *p, int flags)

.. index:: single: Py_PRINT_RAW

Write object *obj* to file object *p*.  The only supported flag for *flags* is
   :const:`Py_PRINT_RAW`; if given, the :func:`str` of the object is written
   instead of the :func:`repr`.  Return ``0`` on success or ``-1`` on failure; the
   appropriate exception will be set.

.. c:function:: int PyFile_WriteString(const char *s, PyObject *p)

Write string *s* to file object *p*.  Return ``0`` on success or ``-1`` on
   failure; the appropriate exception will be set.