[Tutor] assigning list to keys

[bob gailer]

Christian Witts wrote:
> 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

Don't you mean dict['int'] = list[-1]?
>
> 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.
>


-- 
Bob Gailer
Chapel Hill NC
919-636-4239