sysconfig — Provide access to Python’s configuration information
New in version 3.2.
Source code: Lib/sysconfig.py
sysconfig module provides access to Python’s configuration
information like the list of installation paths and the configuration variables
relevant for the current platform.
29.2.1. Configuration variables
A Python distribution contains a
Makefile and a
header file that are necessary to build both the Python binary itself and
third-party C extensions compiled using
Notice that on Windows, it’s a much smaller set.
With no arguments, return a dictionary of all configuration variables relevant for the current platform.
With arguments, return a list of values that result from looking up each argument in the configuration variable dictionary.
For each argument, if the value is not found, return
Return the value of a single variable name. Equivalent to
If name is not found, return
Example of usage:
>>> import sysconfig >>> sysconfig.get_config_var('Py_ENABLE_SHARED') 0 >>> sysconfig.get_config_var('LIBDIR') '/usr/local/lib' >>> sysconfig.get_config_vars('AR', 'CXX') ['ar', 'g++']
29.2.2. Installation paths
Python uses an installation scheme that differs depending on the platform and on
the installation options. These schemes are stored in
unique identifiers based on the value returned by
Every new component that is installed using
distutils or a
Distutils-based system will follow the same scheme to copy its file in the right
Python currently supports seven schemes:
- posix_prefix: scheme for Posix platforms like Linux or Mac OS X. This is the default scheme used when Python or a component is installed.
- posix_home: scheme for Posix platforms used when a home option is used upon installation. This scheme is used when a component is installed through Distutils with a specific home prefix.
- posix_user: scheme for Posix platforms used when a component is installed through Distutils and the user option is used. This scheme defines paths located under the user home directory.
- nt: scheme for NT platforms like Windows.
- nt_user: scheme for NT platforms, when the user option is used.
Each scheme is itself composed of a series of paths and each path has a unique identifier. Python currently uses eight paths:
- stdlib: directory containing the standard Python library files that are not platform-specific.
- platstdlib: directory containing the standard Python library files that are platform-specific.
- platlib: directory for site-specific, platform-specific files.
- purelib: directory for site-specific, non-platform-specific files.
- include: directory for non-platform-specific header files.
- platinclude: directory for platform-specific header files.
- scripts: directory for script files.
- data: directory for data files.
sysconfig provides some functions to determine these paths.
Return a tuple containing all schemes currently supported in
Return a tuple containing all path names currently supported in
get_path(name[, scheme[, vars[, expand]]])
Return an installation path corresponding to the path name, from the install scheme named scheme.
name has to be a value from the list returned by
sysconfigstores installation paths corresponding to each path name, for each platform, with variables to be expanded. For instance the stdlib path for the nt scheme is:
If scheme is provided, it must be a value from the list returned by
get_scheme_names(). Otherwise, the default scheme for the current platform is used.
If vars is provided, it must be a dictionary of variables that will update the dictionary return by
If expand is set to
False, the path will not be expanded using the variables.
If name is not found, return
get_paths([scheme[, vars[, expand]]])
Return a dictionary containing all installation paths corresponding to an installation scheme. See
get_path()for more information.
If scheme is not provided, will use the default scheme for the current platform.
If vars is provided, it must be a dictionary of variables that will update the dictionary used to expand the paths.
If expand is set to False, the paths will not be expanded.
29.2.3. Other functions
MAJOR.MINORPython version number as a string. Similar to
Return a string that identifies the current platform.
This is used mainly to distinguish platform-specific build directories and platform-specific built distributions. Typically includes the OS name and version and the architecture (as supplied by
os.uname()), although the exact information included depends on the OS; e.g. for IRIX the architecture isn’t particularly important (IRIX only runs on SGI hardware), but for Linux the kernel version isn’t particularly important.
Examples of returned values:
- linux-alpha (?)
Windows will return one of:
- win-amd64 (64bit Windows on AMD64 (aka x86_64, Intel64, EM64T, etc)
- win-ia64 (64bit Windows on Itanium)
- win32 (all others - specifically, sys.platform is returned)
Mac OS X can return:
For other non-POSIX platforms, currently just returns
Trueif the current Python installation was built from source.
fp is a file-like object pointing to the
A dictionary containing name/value pairs is returned. If an optional dictionary is passed in as the second argument, it is used instead of a new dictionary, and updated with the values read in the file.
Return the path of
Return the path of
sysconfig as a script
You can use
sysconfig as a script with Python’s -m option:
$ python -m sysconfig Platform: "macosx-10.4-i386" Python version: "3.2" Current installation scheme: "posix_prefix" Paths: data = "/usr/local" include = "/Users/tarek/Dev/svn.python.org/py3k/Include" platinclude = "." platlib = "/usr/local/lib/python3.2/site-packages" platstdlib = "/usr/local/lib/python3.2" purelib = "/usr/local/lib/python3.2/site-packages" scripts = "/usr/local/bin" stdlib = "/usr/local/lib/python3.2" Variables: AC_APPLE_UNIVERSAL_BUILD = "0" AIX_GENUINE_CPLUSPLUS = "0" AR = "ar" ARFLAGS = "rc" ASDLGEN = "./Parser/asdl_c.py" ...