Merge pull request #2768 from pypa/bugfix/2765-suppress-removed-entry…

…-points

In Distribution.finalize_options, suppress known removed entry points

changelog.d/2765.patch.rst

@@ -0,0 +1 @@
+In Distribution.finalize_options, suppress known removed entry points to avoid issues with older Setuptools.

setuptools/dist.py

@@ -817,10 +817,26 @@ def finalize_options(self):
         def by_order(hook):
             return getattr(hook, 'order', 0)
 
-        eps = map(lambda e: e.load(), pkg_resources.iter_entry_points(group))
-        for ep in sorted(eps, key=by_order):
+        defined = pkg_resources.iter_entry_points(group)
+        filtered = itertools.filterfalse(self._removed, defined)
+        loaded = map(lambda e: e.load(), filtered)
+        for ep in sorted(loaded, key=by_order):
             ep(self)
 
+    @staticmethod
+    def _removed(ep):
+        """
+        When removing an entry point, if metadata is loaded
+        from an older version of Setuptools, that removed
+        entry point will attempt to be loaded and will fail.
+        See #2765 for more details.
+        """
+        removed = {
+            # removed 2021-09-05
+            '2to3_doctests',
+        }
+        return ep.name in removed
+
     def _finalize_setup_keywords(self):
         for ep in pkg_resources.iter_entry_points('distutils.setup_keywords'):
             value = getattr(self, ep.name, None)