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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_attached_bytes_map(meta_graph):
 """Returns the dict of ModuleAttachments stored in `meta_graph`. Args: meta_graph: A MetaGraphDef, as built by SavedModelHandler.add_graph_copy() from some graph. Returns: A dict, containing the `(key, bytes)` items passed to `attach_bytes()` when the graph had been built. Raises: ValueError: if `meta-graph` is malformed. """

  result = {}
  if ATTACHMENT_COLLECTION_SAVED not in meta_graph.collection_def:
    return result
  collection_def = meta_graph.collection_def[ATTACHMENT_COLLECTION_SAVED]
  if collection_def.WhichOneof("kind") != "bytes_list":
    raise ValueError(
        "Internal CollectionDef for attached messages has kind %s, "
        "expected bytes_list" % collection_def.WhichOneof("kind"))
  attachment = module_attachment_pb2.ModuleAttachment()
  for value in collection_def.bytes_list.value:
    attachment.ParseFromString(value)
    result[attachment.key] = attachment.value  # Immutable; needs no copy.
  return result