Backport PR #12631: Mark initial frame as not hidden.

IPython/core/debugger.py

@@ -287,6 +287,11 b' class Pdb(OldPdb):'
         self.color_scheme_table.set_active_scheme(scheme)
         self.parser.style = scheme
 
+    def set_trace(self, frame=None):
+        if frame is None:
+            frame = sys._getframe().f_back
+        self.initial_frame = frame
+        return super().set_trace(frame)
 
     def hidden_frames(self, stack):
         """
@@ -299,9 +304,11 b' class Pdb(OldPdb):'
         # avoid calling it here to preserve self.curframe_locals.
         # Futhermore, there is no good reason to hide the current frame.
         ip_hide = [
-            False if s[0] is self.curframe else s[0].f_locals.get(
-                "__tracebackhide__", False)
-            for s in stack]
+            False
+            if s[0] in (self.curframe, getattr(self, "initial_frame", None))
+            else s[0].f_locals.get("__tracebackhide__", False)
+            for s in stack
+        ]
         ip_start = [i for i, s in enumerate(ip_hide) if s == "__ipython_bottom__"]
         if ip_start:
             ip_hide = [h if i > ip_start[0] else True for (i, h) in enumerate(ip_hide)]

IPython/core/interactiveshell.py

@@ -740,8 +740,9 b' class InteractiveShell(SingletonConfigurable):'
         if profile_dir is not None:
             self.profile_dir = profile_dir
             return
-        self.profile_dir =\
-            ProfileDir.create_profile_dir_by_name(self.ipython_dir, 'default')
+        self.profile_dir = ProfileDir.create_profile_dir_by_name(
+            self.ipython_dir, "default"
+        )
 
     def init_instance_attrs(self):
         self.more = False