pkgutil.py 文件源码

def read_code(stream):
    # This helper is needed in order for the PEP 302 emulation to
    # correctly handle compiled files
    import marshal

    magic = stream.read(4)
    if magic != importlib.util.MAGIC_NUMBER:
        return None

    stream.read(8) # Skip timestamp and size
    return marshal.load(stream)