util.py 文件源码

def imp_walk(name):
    """
    yields namepart, tuple_or_importer for each path item

    raise ImportError if a name can not be found.
    """
    warnings.warn("imp_walk will be removed in a future version", DeprecationWarning)

    if name in sys.builtin_module_names:
        yield name, (None, None, ("", "", imp.C_BUILTIN))
        return
    paths = sys.path
    res = None
    for namepart in name.split('.'):
        for path_item in paths:
            res = _check_importer_for_path(namepart, path_item)
            if hasattr(res, 'load_module'):
                if res.path.endswith('.py') or res.path.endswith('.pyw'):
                    fp = StringIO(res.get_source(namepart))
                    res = (fp, res.path, ('.py', 'rU', imp.PY_SOURCE))
                elif res.path.endswith('.pyc') or res.path.endswith('.pyo'):
                    co  = res.get_code(namepart)
                    fp = BytesIO(imp.get_magic() + b'\0\0\0\0' + marshal.dumps(co))
                    res = (fp, res.path, ('.pyc', 'rb', imp.PY_COMPILED))

                else:
                    res = (None, loader.path, (os.path.splitext(loader.path)[-1], 'rb', imp.C_EXTENSION))

                break
            elif isinstance(res, tuple):
                break
        else:
            break

        yield namepart, res
        paths = [os.path.join(path_item, namepart)]
    else:
        return

    raise ImportError('No module named %s' % (name,))