[Tutor] __getitem__ another problem

[monikajg at netzero.net]

So numbermap.__getitem__ brings back 1, then 2,then 3, then 4. 
Then it looks up 1 ,2, 3, 4 in month but there is no  key with value 1, 2, or or in 4. 
What am I missing?
Thank you very much
Monika

---------- Original Message ----------
From: Alan Gauld via Tutor <tutor at python.org>
To: tutor at python.org
Subject: Re: [Tutor] __getitem__ another problem
Date: Wed, 23 Nov 2016 10:09:46 +0000

On 23/11/16 06:26, monikajg at netzero.net wrote:

> I do not understand how numbermap.__getitem__ brings back month's key.

numbermap returns the integer corresponding to the key.
That number is then used by sorted as the basis for
sorting month. So for the first entry sorted receives
the value 1, for the second it gets 2. and so on.
It then prints the keys corresponding to those
values.

> 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']

-- 
Alan G
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http://www.alan-g.me.uk/
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