Enforce ruff/refurb rule FURB118

FURB118 Use `operator.itemgetter(0)` instead of defining a lambda

setuptools/command/build_ext.py

@@ -1,3 +1,4 @@
+import operator
 import os
 import sys
 import itertools
@@ -314,7 +315,7 @@ def get_outputs(self) -> List[str]:
     def get_output_mapping(self) -> Dict[str, str]:
         """See :class:`setuptools.commands.build.SubCommand`"""
         mapping = self._get_output_mapping()
-        return dict(sorted(mapping, key=lambda x: x[0]))
+        return dict(sorted(mapping, key=operator.itemgetter(0)))
 
     def __get_stubs_outputs(self):
         # assemble the base name for each extension that needs a stub

setuptools/command/build_py.py

@@ -2,6 +2,7 @@
 from glob import glob
 from distutils.util import convert_path
 import distutils.command.build_py as orig
+import operator
 import os
 import fnmatch
 import textwrap
@@ -142,7 +143,7 @@ def get_output_mapping(self) -> Dict[str, str]:
             self._get_package_data_output_mapping(),
             self._get_module_mapping(),
         )
-        return dict(sorted(mapping, key=lambda x: x[0]))
+        return dict(sorted(mapping, key=operator.itemgetter(0)))
 
     def _get_module_mapping(self) -> Iterator[Tuple[str, str]]:
         """Iterate over all modules producing (dest, src) pairs."""

setuptools/command/editable_wheel.py

@@ -12,6 +12,7 @@
 
 import logging
 import io
+import operator
 import os
 import shutil
 import traceback
@@ -888,7 +889,7 @@ def _finder_template(
     """Create a string containing the code for the``MetaPathFinder`` and
     ``PathEntryFinder``.
     """
-    mapping = dict(sorted(mapping.items(), key=lambda p: p[0]))
+    mapping = dict(sorted(mapping.items(), key=operator.itemgetter(0)))
     return _FINDER_TEMPLATE.format(name=name, mapping=mapping, namespaces=namespaces)