gh-109500: Allow pstats to load files with empty profiling data

Author: krylosov-aa

Lib/pstats.py

@@ -150,6 +150,7 @@ def load_stats(self, arg):
             except:  # in case this is not unix
                 pass
             self.files = [arg]
+            return
         elif hasattr(arg, 'create_stats'):
             arg.create_stats()
             self.stats = arg.stats

Lib/test/test_pstats.py

@@ -45,6 +45,18 @@ def test_add(self):
         stats = pstats.Stats(stream=stream)
         stats.add(self.stats, self.stats)
 
+    def test_empty_stats(self):
+        # gh-109500: Empty profiling data must not prevent loading or
+        # combining statistics.
+        stats_file = support.findfile('pstats.pck')
+        profile = cProfile.Profile()
+        with tempfile.TemporaryDirectory() as tmpdir:
+            filename = os.path.join(tmpdir, 'empty.prof')
+            profile.dump_stats(filename)
+            self.assertEqual(pstats.Stats(profile, filename).stats, {})
+            stats = pstats.Stats(filename, stats_file)
+            self.assertEqual(stats.stats, self.stats.stats)
+
     def test_dump_and_load_works_correctly(self):
         temp_storage_new = tempfile.NamedTemporaryFile(delete=False)
         try:

Misc/NEWS.d/next/Library/2026-09-28-20-09-02.gh-issue-109500._T9cBe.rst

@@ -0,0 +1,2 @@
+Fix :class:`pstats.Stats` and :meth:`pstats.Stats.add` raising
+:exc:`TypeError` when loading files containing empty profiling data.