easy_install.py 文件源码

def _collect_zipimporter_cache_entries(normalized_path, cache):
    """
    Return zipimporter cache entry keys related to a given normalized path.

    Alternative path spellings (e.g. those using different character case or
    those using alternative path separators) related to the same path are
    included. Any sub-path entries are included as well, i.e. those
    corresponding to zip archives embedded in other zip archives.

    """
    result = []
    prefix_len = len(normalized_path)
    for p in cache:
        np = normalize_path(p)
        if (np.startswith(normalized_path) and
                np[prefix_len:prefix_len + 1] in (os.sep, '')):
            result.append(p)
    return result