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Setting a breakpoint on a function from within that functions makes
pdb to stop at the following line (where no breakpoint is set) after a
continue command. In the following test pdb stops at line 3 where
there is no breakpoint.
=== main.py =================================
def foo():
 x = 1
 x = 2
foo()
=================================================
$ python -m pdb main.py
> /path_to/main.py(1)<module>()
-> def foo():
(Pdb) import sys; print(sys.version)
3.3.0a3+ (default:4e9680570be8, May 11 2012, 12:09:15) 
[GCC 4.3.2]
(Pdb) break 2
Breakpoint 1 at /path_to/main.py:2
(Pdb) continue
> /path_to/main.py(2)foo()
-> x = 1
(Pdb) break foo
Breakpoint 2 at /path_to/main.py:1
(Pdb) continue
> /path_to/main.py(3)foo()
-> x = 2
(Pdb) where
 /home/xavier/src/cpython/cpython-hg-default/Lib/bdb.py(405)run()
-> exec(cmd, globals, locals)
 <string>(1)<module>()
 /path_to/main.py(5)<module>()
-> foo()
> /path_to/main.py(3)foo()
-> x = 2
(Pdb) quit
=================================================
The attached patch fixes the problem. The patch includes a test case.