easy_install.py 文件源码

def _remove_and_clear_zip_directory_cache_data(normalized_path):
    def clear_and_remove_cached_zip_archive_directory_data(path, old_entry):
        old_entry.clear()

    _update_zipimporter_cache(
        normalized_path, zipimport._zip_directory_cache,
        updater=clear_and_remove_cached_zip_archive_directory_data)

# PyPy Python implementation does not allow directly writing to the
# zipimport._zip_directory_cache and so prevents us from attempting to correct
# its content. The best we can do there is clear the problematic cache content
# and have PyPy repopulate it as needed. The downside is that if there are any
# stale zipimport.zipimporter instances laying around, attempting to use them
# will fail due to not having its zip archive directory information available
# instead of being automatically corrected to use the new correct zip archive
# directory information.