sort string by number inside

Question

I would like to know how can I sort a string by the number inside.

As example I have:

hello = " hola %d" % (number_from_database)
bye = "adios %d" % (number_from_database_again)

I want to sort them by the number even if it changes.

Answer 1

You can pass a key to sort:

sorted(l, key=lambda x: int(re.sub('\D', '', x)))

For example:

In [1]: import re

In [2]: l = ['asdas2', 'asdas1', 'asds3ssd']

In [3]: sorted(l, key=lambda x: int(re.sub('\D', '', x)))
Out[3]: ['asdas1', 'asdas2', 'asds3ssd']

Where re.sub('\D', '', x) replaces everything but the digits.