For an in-place sort, use
foo = [(list of tuples)]
foo.sort(key=lambda x:x[0]) #To sort by first element of the tuple
For Python 2.7+
, this works which makes the accepted answer slightly more readable:
sorted([('abc', 121),('abc', 231),('abc', 148), ('abc',221)], key=lambda (k, val): val)
Adding to Cheeken's answer, This is how you sort a list of tuples by the 2nd item in descending order.
sorted([('abc', 121),('abc', 231),('abc', 148), ('abc',221)],key=lambda x: x[1], reverse=True)
As a python neophyte, I just wanted to mention that if the data did actually look like this:
data = [('abc', 121),('abc', 231),('abc', 148), ('abc',221)]
then sorted()
would automatically sort by the second element in the tuple, as the first elements are all identical.
>>> from operator import itemgetter
>>> data = [('abc', 121),('abc', 231),('abc', 148), ('abc',221)]
>>> sorted(data,key=itemgetter(1))
[('abc', 121), ('abc', 148), ('abc', 221), ('abc', 231)]
IMO using itemgetter
is more readable in this case than the solution by @cheeken. It is
also faster since almost all of the computation will be done on the c
side (no pun intended) rather than through the use of lambda
.
>python -m timeit -s "from operator import itemgetter; data = [('abc', 121),('abc', 231),('abc', 148), ('abc',221)]" "sorted(data,key=itemgetter(1))"
1000000 loops, best of 3: 1.22 usec per loop
>python -m timeit -s "data = [('abc', 121),('abc', 231),('abc', 148), ('abc',221)]" "sorted(data,key=lambda x: x[1])"
1000000 loops, best of 3: 1.4 usec per loop
From python wiki:
>>> from operator import itemgetter, attrgetter
>>> sorted(student_tuples, key=itemgetter(2))
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]
>>> sorted(student_objects, key=attrgetter('age'))
[('dave', 'B', 10), ('jane', 'B', 12), ('john', 'A', 15)]
For a lambda-avoiding method, first define your own function:
def MyFn(a):
return a[1]
then:
sorted([('abc', 121),('abc', 231),('abc', 148), ('abc',221)], key=MyFn)
The fact that the sort values in the OP are integers isn't relevant to the question per se. In other words, the accepted answer would work if the sort value was text. I bring this up to also point out that the sort can be modified during the sort (for example, to account for upper and lower case).
>>> sorted([(121, 'abc'), (231, 'def'), (148, 'ABC'), (221, 'DEF')], key=lambda x: x[1])
[(148, 'ABC'), (221, 'DEF'), (121, 'abc'), (231, 'def')]
>>> sorted([(121, 'abc'), (231, 'def'), (148, 'ABC'), (221, 'DEF')], key=lambda x: str.lower(x[1]))
[(121, 'abc'), (148, 'ABC'), (231, 'def'), (221, 'DEF')]
Source: Stackoverflow.com