Question

Recently I had to find which list something was in. I used:

def findPoint(haystack, needle): # haystack = [[1,2,3], [4,5]...,[6,7,8,9]]
    for x in range(len(haystack)):
        if needle in haystack[x]:
            return x
    raise Exception("needle: " + str(needle) + " not in haystack")

There is a haystack.index(needle) method.
The question is: “Is there a better way to do this?”

Answer 1

Yes, no need for range, for starters

for hay in haystack:
  if needle in hay:
    return hay

And if you really really need the index, use enumerate

for x, hay in enumerate(haystack):
  if needle in hay:
    return x