gh-136057: Allow step and next to step over for loops

Lib/bdb.py

@@ -306,7 +306,12 @@ def dispatch_line(self, frame):
         self.user_line(). Raise BdbQuit if self.quitting is set.
         Return self.trace_dispatch to continue tracing in this scope.
         """
-        if self.stop_here(frame) or self.break_here(frame):
+        # GH-136057
+        # For line events, besides whether we should stop at the frame, we
+        # also need to check if it's the same line as we issue the command.
+        if (self.stop_here(frame) or self.break_here(frame)) and not (
+            self.startframe == frame and self.startlineno == frame.f_lineno
+        ):
             self.user_line(frame)
             self.restart_events()
             if self.quitting: raise BdbQuit
@@ -535,7 +540,8 @@ def _set_trace_opcodes(self, trace_opcodes):
             if self.monitoring_tracer:
                 self.monitoring_tracer.update_local_events()
 
-    def _set_stopinfo(self, stopframe, returnframe, stoplineno=0, opcode=False):
+    def _set_stopinfo(self, stopframe, returnframe, stoplineno=0, opcode=False,
+                      startframe=None, startlineno=None):
         """Set the attributes for stopping.
 
         If stoplineno is greater than or equal to 0, then stop at line
@@ -548,6 +554,10 @@ def _set_stopinfo(self, stopframe, returnframe, stoplineno=0, opcode=False):
         # stoplineno >= 0 means: stop at line >= the stoplineno
         # stoplineno -1 means: don't stop at all
         self.stoplineno = stoplineno
+        # startframe/startlineno is the frame/line number when the user does
+        # step or next. We don't want to stop at the same line for those commands.
+        self.startframe = startframe
+        self.startlineno = startlineno
         self._set_trace_opcodes(opcode)
 
     def _set_caller_tracefunc(self, current_frame):
@@ -573,15 +583,17 @@ def set_until(self, frame, lineno=None):
 
     def set_step(self):
         """Stop after one line of code."""
-        self._set_stopinfo(None, None)
+        # set_step() could be called from signal handler so enterframe might be None
+        self._set_stopinfo(None, None, startframe=self.enterframe,
+                           startlineno=getattr(self.enterframe, 'f_lineno', None))
 
     def set_stepinstr(self):
         """Stop before the next instruction."""
         self._set_stopinfo(None, None, opcode=True)
 
     def set_next(self, frame):
         """Stop on the next line in or below the given frame."""
-        self._set_stopinfo(frame, None)
+        self._set_stopinfo(frame, None, startframe=frame, startlineno=frame.f_lineno)
 
     def set_return(self, frame):
         """Stop when returning from the given frame."""

Lib/test/test_pdb.py

@@ -3232,6 +3232,37 @@ def test_pdb_issue_gh_127321():
     """
 
 
+def test_pdb_issue_gh_136057():
+    """See GH-136057
+    "step" and "next" commands should be able to get over list comprehensions
+    >>> def test_function():
+    ...     import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+    ...     lst = [i for i in range(10)]
+    ...     for i in lst: pass
+
+    >>> with PdbTestInput([  # doctest: +NORMALIZE_WHITESPACE
+    ...     'next',
+    ...     'next',
+    ...     'step',
+    ...     'continue',
+    ... ]):
+    ...     test_function()
+    > <doctest test.test_pdb.test_pdb_issue_gh_136057[0]>(2)test_function()
+    -> import pdb; pdb.Pdb(nosigint=True, readrc=False).set_trace()
+    (Pdb) next
+    > <doctest test.test_pdb.test_pdb_issue_gh_136057[0]>(3)test_function()
+    -> lst = [i for i in range(10)]
+    (Pdb) next
+    > <doctest test.test_pdb.test_pdb_issue_gh_136057[0]>(4)test_function()
+    -> for i in lst: pass
+    (Pdb) step
+    --Return--
+    > <doctest test.test_pdb.test_pdb_issue_gh_136057[0]>(4)test_function()->None
+    -> for i in lst: pass
+    (Pdb) continue
+    """
+
+
 def test_pdb_issue_gh_80731():
     """See GH-80731
 

Misc/NEWS.d/next/Library/2025-07-01-04-57-57.gh-issue-136057.4-t596.rst

@@ -0,0 +1 @@
+Fixed the bug in :mod:`pdb` and :mod:`bdb` where ``next`` and ``step`` can't go over the line if a loop exists in the line.