#!/usr/bin/python

def raisinggenfunc():
  yield 1
  raise ValueError("spurious error")
  yield 3

def wrapper(gen):
  while True:
    try:
      value = next(gen)
    except StopIteration:
      raise
    except Exception as e:
      print(e)
    else:
      yield value

def raiseon2(i):
  if i == 2:
    raise ValueError("spurious error")
  return i

raisinggen = (raiseon2(i) for i in range(1, 4))

print(list(wrapper(raisinggenfunc())))
print(list(wrapper(raisinggen)))