Function get_config_vars

Lib/sysconfig/__init__.py:594–631

With no arguments, return a dictionary of all configuration variables relevant for the current platform. On Unix, this means every variable defined in Python's installed Makefile; On Windows it's a much smaller set. With arguments, return a list of values that result from looking u

(*args)

def get_config_vars(*args):
    """With no arguments, return a dictionary of all configuration
    variables relevant for the current platform.

    On Unix, this means every variable defined in Python's installed Makefile;
    On Windows 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_INITIALIZED

    # Avoid claiming the lock once initialization is complete.
    if _CONFIG_VARS_INITIALIZED:
        # GH-126789: If sys.prefix or sys.exec_prefix were updated, invalidate the cache.
        prefix = os.path.normpath(sys.prefix)
        exec_prefix = os.path.normpath(sys.exec_prefix)
        if _CONFIG_VARS['prefix'] != prefix or _CONFIG_VARS['exec_prefix'] != exec_prefix:
            with _CONFIG_VARS_LOCK:
                _CONFIG_VARS_INITIALIZED = False
                _init_config_vars()
    else:
        # Initialize the config_vars cache.
        with _CONFIG_VARS_LOCK:
            # Test again with the lock held to avoid races. Note that
            # we test _CONFIG_VARS here, not _CONFIG_VARS_INITIALIZED,
            # to ensure that recursive calls to get_config_vars()
            # don't re-enter init_config_vars().
            if _CONFIG_VARS is None:
                _init_config_vars()

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


def get_config_var(name):