[Tutor] assigning list to keys

[Christian Witts]

Todd Matsumoto wrote:
> Hello,
>
> The other day I needed to pack a dictionary, the value of each key was a list. In the code I was packing the list and the dictionary at the same time. First I tried something like this:
>
> list = []
> dict = {}
> x = 1
>
> dict['int'] = list.append(x)
>
> The result was {'int': None}. Why is the value None?
>
> Cheers,
>
> T
>   
Hi,

Appending to a list does so in-place and returns None.  If you wish to 
do what you posted you will need to do it in 2 steps with:

    list.append(x)
    dict['int'] = list

You should also avoid shadowing built-in names like "list", "dict", 
"file" etc as you can very easily end up with unexplained errors.

Hope that helps.

-- 
Kind Regards,
Christian Witts