Merge pull request #503 from danielhollas/defer-json

Defer import of json

Author: jaraco

importlib_metadata/__init__.py

@@ -14,7 +14,6 @@
 import email
 import functools
 import itertools
-import json
 import operator
 import os
 import pathlib
@@ -673,6 +672,9 @@ def origin(self):
         return self._load_json('direct_url.json')
 
     def _load_json(self, filename):
+        # Deferred for performance (python/importlib_metadata#503)
+        import json
+
         return pass_none(json.loads)(
             self.read_text(filename),
             object_hook=lambda data: types.SimpleNamespace(**data),

newsfragments/503.feature.rst

@@ -0,0 +1 @@
+Deferred import of json