Bruno Desthuilliers wrote:
> If you want to prevent this from happening and don't mind creating a
> copy of the list, you can use the sorted() function with the key and
> reverse arguments and operator.itemgetter:
>
> >>> lines = [('1995', 'aaa'), ('1997', 'bbb'), ('1995', 'bbb'),
> ('1997', 'aaa'), ('1995', 'ccc'), ('1996', 'ccc'), ('1996', 'aaa')]
> >>> from operator import itemgetter
> >>> sorted(lines, key=itemgetter(0), reverse=True)
> [('1997', 'bbb'), ('1997', 'aaa'), ('1996', 'ccc'), ('1996', 'aaa'),
> ('1995', 'aaa'), ('1995', 'bbb'), ('1995', 'ccc')]
You don't need to use sorted() -- sort() also takes the key= and
reverse= arguments::
>>> lines = [('1995', 'aaa'), ('1997', 'bbb'), ('1995', 'bbb'),
... ('1997', 'aaa'), ('1995', 'ccc'), ('1996', 'ccc'),
... ('1996', 'aaa')]
>>> from operator import itemgetter
>>> lines.sort(key=itemgetter(0), reverse=True)
>>> lines
[('1997', 'bbb'), ('1997', 'aaa'), ('1996', 'ccc'), ('1996', 'aaa'),
('1995', 'aaa'), ('1995', 'bbb'), ('1995', 'ccc')]
STeVe
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