python · gaogaotiantian · Oct 15, 2024 · Oct 15, 2024
diff --git a/Lib/pdb.py b/Lib/pdb.py
@@ -321,8 +321,7 @@ def user_call(self, frame, argument_list):
    def user_line(self, frame):
        """This function is called when we stop or break at this line."""
        if self._wait_for_mainpyfile:
-            if (self.mainpyfile != self.canonic(frame.f_code.co_filename)
-                or frame.f_lineno <= 0):
+            if (self.mainpyfile != self.canonic(frame.f_code.co_filename)):
                return
            self._wait_for_mainpyfile = False
        if self.bp_commands(frame):

diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
@@ -2754,6 +2754,16 @@ 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_empty_file(self):
+        script = ''
+        commands = 'q\n'
+        # We check that pdb stopped at line 0, but anything reasonable
+        # is acceptable here, as long as it does not halt
+        stdout, _ = self.run_pdb_script(script, commands)
+        self.assertIn('main.py(0)', stdout)
+        stdout, _ = self.run_pdb_module(script, commands)
+        self.assertIn('__main__.py(0)', stdout)
+
    def test_non_utf8_encoding(self):
        script_dir = os.path.join(os.path.dirname(__file__), 'encoded_modules')
        for filename in os.listdir(script_dir):

diff --git a/Misc/NEWS.d/next/Library/2024-10-14-02-27-03.gh-issue-100141.NuAcwa.rst b/Misc/NEWS.d/next/Library/2024-10-14-02-27-03.gh-issue-100141.NuAcwa.rst
@@ -0,0 +1 @@
+Fixed the bug where :mod:`pdb` will be stuck in an infinite loop when debugging an empty file.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Fixed the bug where :mod:`pdb` will be stuck in an infinite loop when debugging an empty file.