Script which deletes odd numbers from a list (Python)

Question

I've written a function designed to delete all odd numbers from a list.

def purify(l):

    for e in range(len(l)):

        if l[e] % 2 != 0:

            del l[e]

    return l



v = [4, 5, 5, 6]

print purify(v)

But when it starts executing list v it doesn't work from second cycle and gives an error: "IndexError: list index out of range". Why? What's wrong with the code?

Answer 1

The easiest way to do what you want may be by means of a list comprehension:

def purify(l):
    return [e for e in l if not (e % 2)]

Script which deletes odd numbers from a list (Python)

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