filter() removes falsy values

Question

Accepted Answer

filter(None, iterable) removes all falsy values: None, '', 0, and False are all falsy. Only 1, 2, and 3 are truthy and survive. This is identical to [x for x in data if x] but more concise when the test is just truthiness. Be careful: 0 and empty strings may be legitimate values in your data — use a more specific condition if you only want to remove None.