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:mod:`compileall` --- Byte-compile Python libraries
===================================================
.. module:: compileall
:synopsis: Tools for byte-compiling all Python source files in a directory tree.
**Source code:** :source:`Lib/compileall.py`
--------------
This module provides some utility functions to support installing Python
libraries. These functions compile Python source files in a directory tree.
This module can be used to create the cached byte-code files at library
installation time, which makes them available for use even by users who don't
have write permission to the library directories.
Command-line use
----------------
This module can work as a script (using :program:`python -m compileall`) to
compile Python sources.
.. program:: compileall
.. cmdoption:: directory ...
file ...
Positional arguments are files to compile or directories that contain
source files, traversed recursively. If no argument is given, behave as if
the command line was ``-l <directories from sys.path>``.
.. cmdoption:: -l
Do not recurse into subdirectories, only compile source code files directly
contained in the named or implied directories.
.. cmdoption:: -f
Force rebuild even if timestamps are up-to-date.
.. cmdoption:: -q
Do not print the list of files compiled, print only error messages.
.. cmdoption:: -d destdir
Directory prepended to the path to each file being compiled. This will
appear in compilation time tracebacks, and is also compiled in to the
byte-code file, where it will be used in tracebacks and other messages in
cases where the source file does not exist at the time the byte-code file is
executed.
.. cmdoption:: -x regex
regex is used to search the full path to each file considered for
compilation, and if the regex produces a match, the file is skipped.
.. cmdoption:: -i list
Read the file ``list`` and add each line that it contains to the list of
files and directories to compile. If ``list`` is ``-``, read lines from
``stdin``.
.. versionchanged:: 2.7
Added the ``-i`` option.
Public functions
----------------
.. function:: compile_dir(dir[, maxlevels[, ddir[, force[, rx[, quiet]]]]])
Recursively descend the directory tree named by *dir*, compiling all :file:`.py`
files along the way.
The *maxlevels* parameter is used to limit the depth of the recursion; it
defaults to ``10``.
If *ddir* is given, it is prepended to the path to each file being compiled
for use in compilation time tracebacks, and is also compiled in to the
byte-code file, where it will be used in tracebacks and other messages in
cases where the source file does not exist at the time the byte-code file is
executed.
If *force* is true, modules are re-compiled even if the timestamps are up to
date.
If *rx* is given, its search method is called on the complete path to each
file considered for compilation, and if it returns a true value, the file
is skipped.
If *quiet* is true, nothing is printed to the standard output unless errors
occur.
.. function:: compile_file(fullname[, ddir[, force[, rx[, quiet]]]])
Compile the file with path *fullname*.
If *ddir* is given, it is prepended to the path to the file being compiled
for use in compilation time tracebacks, and is also compiled in to the
byte-code file, where it will be used in tracebacks and other messages in
cases where the source file does not exist at the time the byte-code file is
executed.
If *rx* is given, its search method is passed the full path name to the
file being compiled, and if it returns a true value, the file is not
compiled and ``True`` is returned.
If *quiet* is true, nothing is printed to the standard output unless errors
occur.
.. versionadded:: 2.7
.. function:: compile_path([skip_curdir[, maxlevels[, force]]])
Byte-compile all the :file:`.py` files found along ``sys.path``. If
*skip_curdir* is true (the default), the current directory is not included
in the search. All other parameters are passed to the :func:`compile_dir`
function. Note that unlike the other compile functions, ``maxlevels``
defaults to ``0``.
To force a recompile of all the :file:`.py` files in the :file:`Lib/`
subdirectory and all its subdirectories::
import compileall
compileall.compile_dir('Lib/', force=True)
# Perform same compilation, excluding files in .svn directories.
import re
compileall.compile_dir('Lib/', rx=re.compile(r'[/\\][.]svn'), force=True)
.. seealso::
Module :mod:`py_compile`
Byte-compile a single source file.