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Sayth Renshaw wrote: > I was trying to solve a problem and cannot determine how to filter 0's but > not false. > > Given a list like this > ["a",0,0,"b",None,"c","d",0,1,False,0,1,0,3,[],0,1,9,0,0,{},0,0,9] > > I want to be able to return this list > ["a","b",None,"c","d",1,False,1,3,[],1,9,{},9,0,0,0,0,0,0,0,0,0,0] > > However if I filter like this > > def move_zeros(array): > l1 = [v for v in array if v != 0] > l2 = [v for v in array if v == 0] > return l1 + l2 > > I get this > ['a', 'b', None, 'c', 'd', 1, 1, 3, [], 1, 9, {}, 9, 0, 0, 0, False, 0, 0, > [0, 0, 0, 0, 0] > > I have tried or conditions of v == False etc but then the 0's being false > also aren't moved. How can you check this at once? > > > Cheers > > Sayth Another option is to test for type(value) == int: >>> before = ["a",0,0,"b",None,"c","d",0,1,False,0,1,0,3,[],0,1,9,0,0, {},0,0,9] >>> wanted = ["a","b",None,"c","d",1,False,1,3,[],1,9, {},9,0,0,0,0,0,0,0,0,0,0] >>> after = sorted(before, key=lambda x: x == 0 and type(x) == int) >>> assert str(after) == str(wanted) >>> after ['a', 'b', None, 'c', 'd', 1, False, 1, 3, [], 1, 9, {}, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] That way float values will be left alone, too: >>> sorted([0.0, 0, False, [], "x"], key=lambda x: x == 0 and type(x) == int) [0.0, False, [], 'x', 0]

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