Python - Convert partial sublist's elements into int

Question

Suppose you have a list like:

[["a", "1", "2", "3"], ["b", "4", "5", "6"], ["c", "7", "8", "9"]]

And I want to convert the elements from index 1 to 2 of every sublist into integers as you can see they are themselves strings. Is it possible? If it is, then what is the shortest way to do it? What have I done uptil now is this:

lists = [["a", "1", "2", "3"], ["b", "4", "5", "6"], ["c", "7", "8", "9"]]
for l in lists:
    l[1:4] = [int(x) for x in l[1:4]]
print(lists)

possible duplicate of [Convert all strings in a list to int](http://stackoverflow.com/questions/7368789/convert-all-strings-in-a-list-to-int) — Torxed, Mar 08 '14 at 17:11
Just keep in mind that having a multi-type list (i.e. a list with more than one type of variables) is considered a bad practice and it would not work in many other programming languages :) Cheers, Alex — Alex Koukoulas, Mar 08 '14 at 17:14
@mbatchkarov: the obvious thing wrong with the questioner's code is that they say they want to convert elements 1 to 2, but the code actually converts elements 1 to 3 ;-) — Steve Jessop, Mar 08 '14 at 18:03

score 4 · Answer 1 · answered Mar 08 '14 at 17:10

4

If you want to convert the lists inplace, your code is good enough.

BTW, the list comprehension can be replaced with map:

l[1:4] = map(int, l[1:4])

answered Mar 08 '14 at 17:10

falsetru

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Haha, i was 5 seconds to late :) +1 – Torxed Mar 08 '14 at 17:10

Python - Convert partial sublist's elements into int

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