ipdb: fix formatting in core.debugger

IPython/core/debugger.py

@@ -50,6 +50,7 b' from pdb import Pdb as OldPdb'
 # it does so with some limitations.  The rest of this support is implemented in
 # the Tracer constructor.
 
+
 def make_arrow(pad):
     """generate the leading arrow in front of traceback or debugger"""
     if pad >= 2:
@@ -272,7 +273,6 b' class Pdb(OldPdb):'
         cst['Neutral'].colors.breakpoint_enabled = C.LightRed
         cst['Neutral'].colors.breakpoint_disabled = C.Red
 
-
         # Add a python parser so we can syntax highlight source while
         # debugging.
         self.parser = PyColorize.Parser(style=color_scheme)
@@ -488,7 +488,6 b' class Pdb(OldPdb):'
 
         return tpl_line % (bp_mark_color + bp_mark, num, line)
 
-
     def print_list_lines(self, filename, first, last):
         """The printing (as opposed to the parsing part of a 'list'
         command."""
@@ -706,7 +705,7 b' class Pdb(OldPdb):'
 
         Will skip hidden frames.
         """
-        ## modified version of upstream that skips
+        # modified version of upstream that skips
         # frames with __tracebackide__
         if self.curindex == 0:
             self.error("Oldest frame")