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Simple solution is to catch TypeError in bdb's run function:
 try:
 if not isinstance(cmd, types.CodeType):
 cmd = cmd+'\n'
 except TypeError:
 pass
Now it seems that handling nonstring arguments is better:
>>> import pdb
>>> def x():pass
...
>>> pdb.run(x())
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "/home/jkk/python-svn/Lib/pdb.py", line 1122, in run
 Pdb().run(statement, globals, locals)
 File "/home/jkk/python-svn/Lib/bdb.py", line 369, in run
 exec cmd in globals, locals
TypeError: exec: arg 1 must be a string, file, or code object
>>> pdb.run('x()')
> <string>(1)<module>()
(Pdb) x
<function x at 0x4024a9cc>
(Pdb) pdb.run('x()')
(Pdb)
>>>