sysconfig.py 文件源码

def get_config_vars(*args):
    """With no arguments, return a dictionary of all configuration
    variables relevant for the current platform.  Generally this includes
    everything needed to build extensions and install both pure modules and
    extensions.  On Unix, this means every variable defined in Python's
    installed Makefile; on Windows and Mac OS it's a much smaller set.

    With arguments, return a list of values that result from looking up
    each argument in the configuration variable dictionary.
    """
    global _config_vars
    if _config_vars is None:
        func = globals().get("_init_" + os.name)
        if func:
            func()
        else:
            _config_vars = {}

        # Normalized versions of prefix and exec_prefix are handy to have;
        # in fact, these are the standard versions used most places in the
        # Distutils.
        _config_vars['prefix'] = PREFIX
        _config_vars['exec_prefix'] = EXEC_PREFIX

        # OS X platforms require special customization to handle
        # multi-architecture, multi-os-version installers
        if sys.platform == 'darwin':
            import _osx_support
            _osx_support.customize_config_vars(_config_vars)

    if args:
        vals = []
        for name in args:
            vals.append(_config_vars.get(name))
        return vals
    else:
        return _config_vars