__init__.py 文件源码

def make_legacy_pyc(source):
    """Move a PEP 3147 pyc/pyo file to its legacy pyc/pyo location.

    The choice of .pyc or .pyo extension is done based on the __debug__ flag
    value.

    :param source: The file system path to the source file.  The source file
        does not need to exist, however the PEP 3147 pyc file must exist.
    :return: The file system path to the legacy pyc file.
    """
    pyc_file = importlib.util.cache_from_source(source)
    up_one = os.path.dirname(os.path.abspath(source))
    legacy_pyc = os.path.join(up_one, source + ('c' if __debug__ else 'o'))
    os.rename(pyc_file, legacy_pyc)
    return legacy_pyc