Python filter / max combo - checking for empty iterator

Question

(Using Python 3.1)

I know this question has been asked many times for the general question of testing if iterator is empty; obviously, there\'s no neat solution to t

Answer 1

def f(lst):
    # if you want the exact same filtering as the original, you could use
    # lst = [item for item in lst if (item is not None and item != 0)]

    lst = [item for item in lst if item]
    if lst: return min(lst)
    else: return None

the list comprehension only allows items that don't evaluate to boolean false (which filters out 0 and None)

an empty list i.e. [] will evaluate to False, so "if lst:" will only trigger if the list has items