Pdb 'clear x' command doesn't clear selected breakpoints
that are already set:

$ ./python -m pdb ../test.py
> /home/xyz/python/test.py(3)<module>()
-> def t(x):
(Pdb) break 5
Breakpoint 1 at /home/xyz/python/test.py:5
(Pdb) break
Num Type         Disp Enb   Where
1   breakpoint   keep yes   at /home/xyz/python/test.py:5
(Pdb) clear 1
No breakpoint numbered 1
(Pdb)                    
...
  for i in numberlist:
*  if not (0 <= i < len(bdb.Breakpoint.bpbynumber)): 
    print 'No breakpoint numbered', i
...

Each i is a string and it's compared to 0 and len(...),
so condition * is always True. 
The fix is trivial:
*  if not (0 <= int(i) < len(bdb.Breakpoint.bpbynumber)):

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user_id=849994

Problem was fixed in rev. 45891, 45892(2.4), including
better error handling.