CODEWITHSUNDEEP
pythonlist
selubamih
selubamih

Reputation: 83

Create two lists from one list in python?

I have one string list that contains numbers seperated by a comma. I want to create two lists of integers from it. That is:

l=["23,2","11,2","12,7"]

What I want to do is:

l1=[23,11,12]
l2=[2,2,7]

I will appreciate any help.

Upvotes: 2

Views: 4936

Answers (3)

J. Dykstra
J. Dykstra

Reputation: 211

Ajax1234's way is very pythonic and undoubtedly the best. But maybe this is a bit simpler to understand if new to the language. It uses splicing:

from itertools import chain

l=["23,2","11,2","12,7"]
l = [x.split(',') for x in l] #Split list elements by comma.
l = list(chain.from_iterable(l)) #Get rid of tuples.
list1 = l[::2] #Take every even indexed element, including 0.
list2 = l[1::2] #Takes every odd indexed element.

Output:

[23, 11, 12]
[2, 2, 7]

Here is a link to someone who explains it better.

Upvotes: 1

Sunny Patel
Sunny Patel

Reputation: 8078

Can you use zip() to rip it apart based on splitting each sting by the comma , and map each substring to an int`.

l = ["23,2","11,2","12,7"]
l1, l2 = zip(*[map(int, x.split(',')) for x in l])
# l1 = (23, 11, 12)
# l2 = (2, 2, 7)

Upvotes: 1

Ajax1234
Ajax1234

Reputation: 71451

You can use zip:

l=["23,2","11,2","12,7"]
l1, l2 = [list(d) for d in zip(*[[int(i) for i in c.split(',')] for c in l])]

Output:

[23, 11, 12]
[2, 2, 7]

Upvotes: 2

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