Python Sorting a list of lists

Question

I am currently trying to sort a list such as the following. I need to sort the lists in order of the second element in each sub-list.

chars = [['Andrew', '1'], ['James', '12'], ['Sam', '123'], ['Zane', '2']]

I am currently using this command:

chars = sorted(chars, key=itemgetter(1))

My Ideal output would be:

chars = [['Andrew', '1'], ['Zane', '2'], ['James', '12'], ['Sam', '123']]

For completeness, you should post the output you're getting. — juanchopanza
– juanchopanza, Commented Sep 18, 2015 at 7:56

Ozgur Vatansever · Accepted Answer · 2015-09-18 07:55:18Z

10

You need to convert second element into integer first for sorting:

>>> sorted(chars, key=lambda x: int(x[1]))
[['Andrew', '1'], ['Zane', '2'], ['James', '12'], ['Sam', '123']]

If you want to do it using operator.itemgetter:

>>> sorted(chars, key=lambda x: int(itemgetter(1)(x)))
[['Andrew', '1'], ['Zane', '2'], ['James', '12'], ['Sam', '123']]

answered Sep 18, 2015 at 7:55

Ozgur Vatansever

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Pynchia · Accepted Answer · 2015-09-18 08:03:47Z

0

def myCmp(x, y):
    if int(x[1])>int(y[1]):
        return 1
    else:
        return -1

chars.sort(cmp=myCmp)#chars.sort(key=lambda x:int(x[1]))

print chars

output:

[['Andrew', '1'], ['Zane', '2'], ['James', '12'], ['Sam', '123']]

Maybe can help you.

edited Sep 18, 2015 at 8:03

Pynchia

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answered Sep 18, 2015 at 7:57

huang

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