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Date: Mon, 19 Jan 2015 16:54:24 -0800
Subject: Re: Concerning Dictionaries and += in Python 2.x
From: Dan Stromberg <drsalists@gmail.com>
To: Luke Tomaneng <luketomaneng@gmail.com>
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Xref: csiph.com comp.lang.python:84047

On Mon, Jan 19, 2015 at 4:12 PM, Luke Tomaneng <luketomaneng@gmail.com> wro=
te:
> I have been having a bit of trouble with the things mentioned in the titl=
e. I have written the following script for a Codecademy course:
> stock =3D {
>     "banana": 6,
>     "apple": 0,
>     "orange": 32,
>     "pear": 15
> }
>
> prices =3D {
>     "banana": 4,
>     "apple": 2,
>     "orange": 1.5,
>     "pear": 3
> }
>
> def compute_bill(food):
>     total =3D 0
>     for item in food:
>         if stock[item] > 0:
>             total +=3D prices[item]
>             stock[item] =3D stock[item] - 1
>             return total
> Whenever I run this script, "4" is returned. It does not seem to matter w=
hat in in the list the script is run on. I have tried this on the Codecadem=
y interpreter/emulator (I'm not sure which they use) and the repl.it interp=
reter, but for the same result. If anyone could find the glitch in my code,=
 please let me know. Thanks!

You're returning total inappropriately - the first time stock[item] is > 0.