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增加检测升级功能
更新PY模块

venv/Lib/site-packages/_distutils_hack/__init__.py

@@ -3,6 +3,7 @@ import os
 import re
 import importlib
 import warnings
+import contextlib
 
 
 is_pypy = '__pypy__' in sys.builtin_module_names
@@ -52,9 +53,8 @@ def ensure_local_distutils():
     # With the DistutilsMetaFinder in place,
     # perform an import to cause distutils to be
     # loaded from setuptools._distutils. Ref #2906.
-    add_shim()
-    importlib.import_module('distutils')
-    remove_shim()
+    with shim():
+        importlib.import_module('distutils')
 
     # check that submodules load as expected
     core = importlib.import_module('distutils.core')
@@ -86,10 +86,23 @@ class DistutilsMetaFinder:
         import importlib.abc
         import importlib.util
 
+        try:
+            mod = importlib.import_module('setuptools._distutils')
+        except Exception:
+            # There are a couple of cases where setuptools._distutils
+            # may not be present:
+            # - An older Setuptools without a local distutils is
+            #   taking precedence. Ref #2957.
+            # - Path manipulation during sitecustomize removes
+            #   setuptools from the path but only after the hook
+            #   has been loaded. Ref #2980.
+            # In either case, fall back to stdlib behavior.
+            return
+
         class DistutilsLoader(importlib.abc.Loader):
 
             def create_module(self, spec):
-                return importlib.import_module('setuptools._distutils')
+                return mod
 
             def exec_module(self, module):
                 pass
@@ -130,6 +143,19 @@ DISTUTILS_FINDER = DistutilsMetaFinder()
 
 
 def add_shim():
+    DISTUTILS_FINDER in sys.meta_path or insert_shim()
+
+
+@contextlib.contextmanager
+def shim():
+    insert_shim()
+    try:
+        yield
+    finally:
+        remove_shim()
+
+
+def insert_shim():
     sys.meta_path.insert(0, DISTUTILS_FINDER)