bug/poor tracebacks while importing code

[Mark McEahern]

The code I previously posted was wrong--I was typing it by-hand instead of
copying it into the message:

$ cat a.py
import b

$ cat b.py
def foo():
    try:
        x = 1/0
    except ValueError, e:
        pass

foo()

$ python a.py
Traceback (most recent call last):
  File "a.py", line 1, in ?
    import b
  File "b.py", line 7, in ?
    foo()
  File "b.py", line 3, in foo
    x = 1/0
ZeroDivisionError: integer division or modulo by zero