replace pkg_resources with importlib.metadata in pshell script

src/pyramid/scripts/pshell.py

@@ -1,8 +1,8 @@
 import argparse
 from code import interact
 from contextlib import contextmanager
+import importlib.metadata
 import os
-import pkg_resources
 import sys
 import textwrap
 
@@ -41,7 +41,7 @@ class PShellCommand:
     script_name = 'pshell'
     bootstrap = staticmethod(bootstrap)  # for testing
     get_config_loader = staticmethod(get_config_loader)  # for testing
-    pkg_resources = pkg_resources  # for testing
+    importlib_metadata = importlib.metadata  # for testing
 
     parser = argparse.ArgumentParser(
         description=textwrap.dedent(description),
@@ -228,10 +228,16 @@ def show_shells(self):
         return 0
 
     def find_all_shells(self):
-        pkg_resources = self.pkg_resources
+        importlib_metadata = self.importlib_metadata
 
         shells = {}
-        for ep in pkg_resources.iter_entry_points('pyramid.pshell_runner'):
+        eps = importlib_metadata.entry_points()
+        if hasattr(eps, 'select'):
+            eps = eps.select(group='pyramid.pshell_runner')
+        else:  # pragma: no cover
+            # fallback for py38 and py39
+            eps = eps.get('pyramid.pshell_runner')
+        for ep in eps:
             name = ep.name
             shell_factory = ep.load()
             shells[name] = shell_factory

tests/test_scripts/test_pshell.py

@@ -1,4 +1,5 @@
 import os
+import sys
 import unittest
 
 from . import dummy
@@ -50,7 +51,10 @@ class Options:
         return cmd
 
     def _makeEntryPoints(self, command, shells):
-        command.pkg_resources = dummy.DummyPkgResources(shells)
+        entry_points = [
+            DummyEntryPoint(name, value) for name, value in shells.items()
+        ]
+        command.importlib_metadata = DummyImportlibMetadata(entry_points)
 
     def test_command_loads_default_shell(self):
         command = self._makeOne()
@@ -430,3 +434,35 @@ def _callFUT(self, argv):
     def test_it(self):
         result = self._callFUT(['pshell'])
         self.assertEqual(result, 2)
+
+
+class DummyImportlibMetadata:
+    def __init__(self, entry_points):
+        self._entry_points = entry_points
+
+    def entry_points(self):
+        return DummyEntryPoints(self._entry_points)
+
+
+class DummyEntryPoints:
+    def __init__(self, entry_points):
+        self._entry_points = entry_points
+
+    if sys.version_info >= (3, 10):
+
+        def select(self, **kw):
+            return iter(self._entry_points)
+
+    else:  # pragma no cover
+
+        def get(self, key):
+            return list(self._entry_points)
+
+
+class DummyEntryPoint:
+    def __init__(self, name, value):
+        self.name = name
+        self.value = value
+
+    def load(self):
+        return self.value