[Tutor] Question about comparing values

[Becky Mcquilling]

Thanks, you are correct of course.  I need to just scrap this and start
over, but I understand it a lot better now.


On Sun, May 22, 2011 at 4:57 PM, Alan Gauld <alan.gauld at btinternet.com>wrote:

> "Becky Mcquilling" <ladymcse2000 at gmail.com> wrote
>
>  I'm doing a tutorial and was given a problem, using shelve.
>>
>
> Remember that a shelve is basically a dictionary stored
> in a file rather than in memory. So treat it like you would
> a dictionary.
>
>
>  Here is what I have so far:
>>
>> import shelve
>>
>> def user_scores():
>>  user_name = input ("What is the user name?").rstrip()
>>  scores = int(input("What is the users score, enter 0 if done"))
>>  shelf = shelve.open('scores.py', writeback=True)
>>  score = [scores]
>>
>
> I've no idea what you think this is doing?
> Its actually creating a single valued list and assigning that to score.
> Is that what you intended? If so why?
>
>
>   user = {user_name:score}
>>  shelf['user'] = user
>>
>
> This is storing a single dictionary under the key 'user'.
> Wouldn't it be easier to store the score under
> the key user_name? That way you could store
> more than one value. As it is you can only ever
> have a single entry for 'user'  in your shelf.
>
>
>
>   shelf.close()
>>  while scores > 0:
>>   scores = int (input("What is the next score"))
>>   shelf = shelve.open('scores.py', writeback=True)
>>   score.append(scores)
>>
>
> OK, so now you append more scores to the liist,
> but I still don't get why you need a list?
>
>    shelf['score'] = score
>>
>
> And now you add a new entry under 'score' which is the
> list of scores.
>
>    shelf.sync()
>>   shelf.close()
>>
>
> So at the end you haven't read anything from your shelf
> but you have written two entries, one with a dictionary
> of name and list. The other with a list of scores where
> the first value happens to be the same as the one stored
> under 'user'
>
> And in memory you still have that raw data, at least
> until you exit the function...
>
>
>  What I'm not sure of is how to compare the values
>> of score, to find and print the one that is highest.
>>
>
> I think you have far bigger problems to solve than that!
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
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