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:mod:`py_compile` --- Compile Python source files
=================================================
.. module:: py_compile
:synopsis: Generate byte-code files from Python source files.
.. sectionauthor:: Fred L. Drake, Jr. <fdrake@acm.org>
.. documentation based on module docstrings
.. index:: pair: file; byte-code
**Source code:** :source:`Lib/py_compile.py`
--------------
The :mod:`py_compile` module provides a function to generate a byte-code file
from a source file, and another function used when the module source file is
invoked as a script.
Though not often needed, this function can be useful when installing modules for
shared use, especially if some of the users may not have permission to write the
byte-code cache files in the directory containing the source code.
.. exception:: PyCompileError
Exception raised when an error occurs while attempting to compile the file.
.. function:: compile(file[, cfile[, dfile[, doraise]]])
Compile a source file to byte-code and write out the byte-code cache file. The
source code is loaded from the file name *file*. The byte-code is written to
*cfile*, which defaults to *file* ``+`` ``'c'`` (``'o'`` if optimization is
enabled in the current interpreter). If *dfile* is specified, it is used as the
name of the source file in error messages instead of *file*. If *doraise* is
true, a :exc:`PyCompileError` is raised when an error is encountered while
compiling *file*. If *doraise* is false (the default), an error string is
written to ``sys.stderr``, but no exception is raised.
.. function:: main([args])
Compile several source files. The files named in *args* (or on the command
line, if *args* is not specified) are compiled and the resulting bytecode is
cached in the normal manner. This function does not search a directory
structure to locate source files; it only compiles files named explicitly.
If ``'-'`` is the only parameter in args, the list of files is taken from
standard input.
.. versionchanged:: 2.7
Added support for ``'-'``.
When this module is run as a script, the :func:`main` is used to compile all the
files named on the command line. The exit status is nonzero if one of the files
could not be compiled.
.. versionchanged:: 2.6
Added the nonzero exit status when module is run as a script.
.. seealso::
Module :mod:`compileall`
Utilities to compile all Python source files in a directory tree.