[3.11] gh-103578: Fix pdb reading code with non-utf8 encoding (GH-103581) (#103867)

`pdb` should use `io.open_code` to open code to avoid encoding issue.
(cherry picked from commit 31acfd7)

Co-authored-by: Tian Gao <[email protected]>

Author: miss-islington

Lib/pdb.py

@@ -154,7 +154,7 @@ def namespace(self):
 
     @property
     def code(self):
-        with io.open(self) as fp:
+        with io.open_code(self) as fp:
             return f"exec(compile({fp.read()!r}, {self!r}, 'exec'))"
 
 

Lib/test/test_pdb.py

@@ -2348,6 +2348,12 @@ def _create_fake_frozen_module():
         # verify that pdb found the source of the "frozen" function
         self.assertIn('x = "Sentinel string for gh-93696"', stdout, "Sentinel statement not found")
 
+    def test_non_utf8_encoding(self):
+        script_dir = os.path.join(os.path.dirname(__file__), 'encoded_modules')
+        for filename in os.listdir(script_dir):
+            if filename.endswith(".py"):
+                self._run_pdb([os.path.join(script_dir, filename)], 'q')
+
 class ChecklineTests(unittest.TestCase):
     def setUp(self):
         linecache.clearcache()  # Pdb.checkline() uses linecache.getline()

Misc/NEWS.d/next/Library/2023-04-16-18-29-04.gh-issue-103578.fly1wc.rst

@@ -0,0 +1 @@
+Fixed a bug where :mod:`pdb` crashes when reading source file with different encoding by replacing :func:`io.open` with :func:`io.open_code`. The new method would also call into the hook set by :func:`PyFile_SetOpenCodeHook`.