Python how to sort this list?

Question

lst = [(1,(1,3,5)), (5,(2,3,4)),(3,(2,3,4))]

I want to sort by the first value, descending order.

mouad · Accepted Answer · 2011-01-10 05:53:42Z

12

just like this:

sorted(lst, reverse=True)

answered Jan 10, 2011 at 5:53

mouad

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2 Comments

nate c Over a year ago

to every other answerer: the index is not required. Python always sorts lists by the first element it finds.

hvr Over a year ago

actually, Python compares tuples by lexicographic order, so it does not only sort lists/tuples by their first elements. This distinction is important if a "stable" sorting by first element is desired.

Mark Tolonen · Accepted Answer · 2011-01-10 06:36:09Z

6

Sort in place? Use:

lst.sort(reverse=True)

answered Jan 10, 2011 at 6:36

Mark Tolonen

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Comments

CTT · Accepted Answer · 2011-01-10 05:51:36Z

4

import operator
sorted(lst, reverse=True, key=operator.itemgetter(0))

answered Jan 10, 2011 at 5:51

CTT

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Raph Levien · Accepted Answer · 2011-01-10 05:51:27Z

0

sorted(list, reverse=True, key=lambda x: x[0])

Note also that "list" isn't a great name for your list because it's the built-in list type.

answered Jan 10, 2011 at 5:51

Raph Levien

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Nyambaa · Accepted Answer · 2011-01-10 05:57:33Z

0

You can sort like this.

sorted(lst, key=lambda a: a[0], reverse=True)

answered Jan 10, 2011 at 5:57

Nyambaa

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