basic generator tracebacks

gistfile1.txt

>>> def g1():
...  for x in g2():
...   yield x
... 
>>> def g2():
...  yield 1
...  yield 2
...  1 / 0
... 
>>> for x in g1(): pass
... 
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "<stdin>", line 2, in g1
  File "<stdin>", line 4, in g2
ZeroDivisionError: integer division or modulo by zero