Breaking List int sub lists-Python

Question

lst  = [[170,True],[210,False],[410,True],[170,True]...]

From this list I need extract into.

sublist1  = [170,210,410,170,..]

sublist2  = [True, False, True, True..]

How can I obtain this?

score 5 · Answer 1 · answered Mar 02 '17 at 17:24

5

You may simply use :

sublist1, sublist2 = zip(*lst)

answered Mar 02 '17 at 17:24

ZdaR

score 1 · Accepted Answer · answered Mar 02 '17 at 17:27

1

Apart from zip(*) (which returns tuples) you can also use two list comprehensions:

sublist1 = [i[0] for i in lst]
sublist2 = [i[1] for i in lst]

answered Mar 02 '17 at 17:27

MSeifert

score 0 · Answer 3 · answered Mar 02 '17 at 17:29

0

You can use map() function like this:

lst  = [[170,True],[210,False],[410,True],[170,True]]
sublist1 = map(lambda n: n[0], lst)
sublist2 = map(lambda n: n[1], lst)

answered Mar 02 '17 at 17:29

Raul Cabrera A.

Depends on the Python version. In python 3.x you need to cast these `map`s to `list`s. – MSeifert Mar 02 '17 at 17:32
You are right :), I ran this code on python 2.7, Thanks! – Raul Cabrera A. Mar 02 '17 at 17:36

3 Answers3