split int and bool values in two different lists

Question

I have the following list:

a = [1104537600, 1199145600, False, 1199145600, 1443886293, True]

and I want to split this list to two sublists such as:

[[1104537600, 1199145600,1199145600, 1443886293],[False,True]]

I am using the following which give that result:

b = [value for value in a if type(value) is int]
c = [value for value in a if type(value) is bool]
d = [b,c]

But is there a more elegant way? In one line?

score 3 · Answer 1 · answered Mar 08 '16 at 09:01

3

Your attempt is pretty and understandable ,more of it you can combine both ur b and c in only one statement as :

d=[[value for value in a if type(value) is bool ],[value for value in a if type(value) is int ]]

answered Mar 08 '16 at 09:01

nsr

855
7
10

score 1 · Answer 2 · answered Mar 08 '16 at 08:56

1

Use the traditional for loop. By this way, you don't need to iterate over the same list for two times.

>>> num, b = [], []
>>> for i in a:
    if type(i) is int:
        num.append(i)
    elif type(i) is bool:
        b.append(i)


>>> num
[1104537600, 1199145600, 1199145600, 1443886293]
>>> b
[False, True]
>>> [num, b]
[[1104537600, 1199145600, 1199145600, 1443886293], [False, True]]

answered Mar 08 '16 at 08:56

Avinash Raj

172,303
28
230
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But is it more elegant? Safe very extreme cases, it won't matter for performance if you iterate it once or twice. – wvdz Mar 08 '16 at 09:07

score 0 · Answer 3 · answered Mar 08 '16 at 08:54

I guess doing it in one line would be less elegant actually. Keep in mind that the most important - if we don't consider performances - is that someone (or you in the future) can easily understand your code.

This one is easily understandable, and not wrong, I would go for it for sure

score 0 · Answer 4 · answered Mar 08 '16 at 09:02

You could build the d list up as follows:

a = [1104537600, 1199145600, False, 1199145600, 1443886293, True]
d = [[], []]

for value in a:
    if type(value) is int:
        d[0].append(value)
    elif type(value) is bool:
        d[1].append(value)    

print d

Giving:

[[1104537600, 1199145600, 1199145600, 1443886293], [False, True]]

split int and bool values in two different lists

4 Answers4