def factory():
def predicate(x):
nonlocal invoked
invoked += 1
return is_prime(x)
return xs.pipe(ops.take_while(predicate))
def factory():
def predicate(x):
nonlocal invoked
invoked += 1
if invoked == 3:
raise Exception(ex)
return is_prime(x)
return xs.pipe(ops.take_while(predicate))