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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.
This module provides some utility functions to support installing Python
libraries. These functions compile Python source files in a directory tree,
allowing users without permission to write to the libraries to take advantage of
cached byte-code files.
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.
.. cmdoption:: -f
Force rebuild even if timestamps are up-to-date.
.. cmdoption:: -q
Do not print the list of files compiled.
.. cmdoption:: -d destdir
Purported directory name for error messages.
.. cmdoption:: -x regex
Skip files with a full path that matches given regular expression.
.. cmdoption:: -i list
Expand list with its content (file and directory names).
.. cmdoption:: -b
Write legacy ``.pyc`` file path names. Default is to write :pep:`3147`-style
byte-compiled path names.
Public functions
----------------
.. function:: compile_dir(dir, maxlevels=10, ddir=None, force=False, rx=None, quiet=False, legacy=False, optimize=-1)
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 used as the
base path from which the filenames used in error messages will be generated.
If *force* is true, modules are re-compiled even if the timestamps are up to
date.
If *rx* is given, it specifies a regular expression of file names to exclude
from the search; that expression is searched for in the full path.
If *quiet* is true, nothing is printed to the standard output in normal
operation.
If *legacy* is true, old-style ``.pyc`` file path names are written,
otherwise (the default), :pep:`3147`-style path names are written.
*optimize* specifies the optimization level for the compiler. It is passed to
the built-in :func:`compile` function.
.. versionchanged:: 3.2
Added the *optimize* parameter.
.. function:: compile_path(skip_curdir=True, maxlevels=0, force=False, legacy=False, optimize=-1)
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.
.. versionchanged:: 3.2
Added the *optimize* parameter.
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('/[.]svn'), force=True)
.. seealso::
Module :mod:`py_compile`
Byte-compile a single source file.
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