Merge pull request #502 from danielhollas/defer-zipp

Defer import of zipp

Author: jaraco

importlib_metadata/__init__.py

@@ -29,8 +29,6 @@
 from itertools import starmap
 from typing import Any, Iterable, List, Mapping, Match, Optional, Set, cast
 
-from zipp.compat.overlay import zipfile
-
 from . import _meta
 from ._collections import FreezableDefaultDict, Pair
 from ._compat import (
@@ -777,6 +775,9 @@ def children(self):
  return []
 
  def zip_children(self):
+ # deferred for performance (python/importlib_metadata#502)
+ from zipp.compat.overlay import zipfile
+
  zip_path = zipfile.Path(self.root)
  names = zip_path.root.namelist()
  self.joinpath = zip_path.joinpath

newsfragments/502.feature.rst

@@ -0,0 +1 @@
+Deferred import of zipfile.Path