code: def find_eggs_in_zip(importer, path_item, only=False):
      
      if importer.archive.endswith('.whl'):
          # wheels are not supported with this finder
          # they don't have PKG-INFO metadata, and won't ever contain eggs
          return
      metadata = EggMetadata(importer)
      if metadata.has_metadata('PKG-INFO'):
          yield Distribution.from_filename(path_item, metadata=metadata)
      if only:
          # don't yield nested distros
          return
      for subitem in metadata.resource_listdir('/'):
          if _is_egg_path(subitem):
              subpath = os.path.join(path_item, subitem)
              dists = find_eggs_in_zip(zipimport.zipimporter(subpath), subpath)
              for dist in dists:
                  yield dist
          elif subitem.lower().endswith('.dist-info'):
              subpath = os.path.join(path_item, subitem)
              submeta = EggMetadata(zipimport.zipimporter(subpath))
              submeta.egg_info = subpath
              yield Distribution.from_location(path_item, subitem, submeta)
docs: Find eggs in zip files; possibly multiple nested eggs.