pythoncard-devel

[Pythoncard-devel] Basic Python question ?

[Alex T. <al...@tw...>]

I see in the resourceEditor a line like

                    if ['List', 'PasswordField', 'TextField', 
'TextArea', 'Calendar'].count(t):

Is there some subtle difference between that and
                     if t in ['List', 'PasswordField', 'TextField', 
'TextArea', 'Calendar']:

or can I change them to something my mind can more easily read :-) ?

-- 
Alex Tweedly       http://www.tweedly.net



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Re: [Pythoncard-devel] Basic Python question ?

[Andy T. <an...@ha...>]

Alex Tweedly wrote:
> I see in the resourceEditor a line like
> 
>                     if ['List', 'PasswordField', 'TextField', 
> 'TextArea', 'Calendar'].count(t):
> 
> Is there some subtle difference between that and
>                      if t in ['List', 'PasswordField', 'TextField', 
> 'TextArea', 'Calendar']:
> 
> or can I change them to something my mind can more easily read :-) ?
> 

 From the documentation [1];

count(x)
     Return the number of times x appears in the list.

So doing if sequence.count(value): also relies on the fact that zero is 
false and non-zero true in Python.

I'd suggest you change it to the 'in' syntax which is more idiomatic and 
easier for people like you and I to understand.

[1] http://docs.python.org/tut/node7.html#SECTION007100000000000000000

Regards,
Andy
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