snippetpythonCritical
Sort a list by multiple attributes?
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attributeslistmultiplesort
Problem
I have a list of lists:
If I wanted to sort by one element, say the tall/short element, I could do it via
If I wanted to sort by both tall/short and colour, I could do the sort twice, once for each element, but is there a quicker way?
[[12, 'tall', 'blue', 1],
[2, 'short', 'red', 9],
[4, 'tall', 'blue', 13]]If I wanted to sort by one element, say the tall/short element, I could do it via
s = sorted(s, key = itemgetter(1)).If I wanted to sort by both tall/short and colour, I could do the sort twice, once for each element, but is there a quicker way?
Solution
A key can be a function that returns a tuple:
Or you can achieve the same using
And notice that here you can use
s = sorted(s, key = lambda x: (x[1], x[2]))Or you can achieve the same using
itemgetter (which is faster and avoids a Python function call):import operator
s = sorted(s, key = operator.itemgetter(1, 2))And notice that here you can use
sort instead of using sorted and then reassigning:s.sort(key = operator.itemgetter(1, 2))Code Snippets
s = sorted(s, key = lambda x: (x[1], x[2]))import operator
s = sorted(s, key = operator.itemgetter(1, 2))s.sort(key = operator.itemgetter(1, 2))Context
Stack Overflow Q#4233476, score: 1282
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