[Tutor] __getitem__ another problem

[monikajg at netzero.net]

Hi:
Can you please explain what is going on below? I do not understand how numbermap.__getitem__ brings back month's key.
Does numbermap.__getitem__ bring back numbermap key or value? If key then it is not consistent with my understanding of problem in my previous email.  So month is sorted by numbermap values or keys?


month = dict(one='January',
                 two='February',
                 three='March',
                 four='April',
                 five='May')
numbermap = {'one': 1, 'two': 2, 'three': 3, 'four': 4, 'five': 5}
sorted(month, key=numbermap.__getitem__)
['one', 'two', 'three', 'four', 'five']
This is from:
http://pythoncentral.io/how-to-sort-python-dictionaries-by-key-or-value/
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