runpy.py 文件源码

def _get_main_module_details():
    # Helper that gives a nicer error message when attempting to
    # execute a zipfile or directory by invoking __main__.py
    main_name = "__main__"
    try:
        return _get_module_details(main_name)
    except ImportError as exc:
        if main_name in str(exc):
            raise ImportError("can't find %r module in %r" %
                              (main_name, sys.path[0]))
        raise


# XXX (ncoghlan): Perhaps expose the C API function
# as imp.get_importer instead of reimplementing it in Python?