Iterate creating variables?

Calvin Spealman ironfroggy at socialserve.com
Fri Jun 13 18:19:59 CEST 2008


On Jun 13, 2008, at 11:56 AM, tdahsu at gmail.com wrote:

> On Jun 13, 11:48 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>> tda... at gmail.com schrieb:
>>
>>
>>
>>> On Jun 13, 11:21 am, "Diez B. Roggisch" <de... at nospam.web.de> wrote:
>>>> tda... at gmail.com schrieb:
>>
>>>>> I have twenty-five checkboxes I need to create (don't ask):
>>>>> self.checkbox1 = ...
>>>>> self.checkbox2 = ...
>>>>> .
>>>>> .
>>>>> .
>>>>> self.checkbox25 = ...
>>>>> Right now, my code has 25 lines in it, one for each checkbox,  
>>>>> since
>>>>> these are all variables.
>>>>> Is there a way to write a loop so that I can have fewer lines  
>>>>> of code
>>>>> but still keep the variables?
>>>>> I've tried:
>>>>> for o in xrange(25):
>>>>>     self.checkbox[o] = ...
>>>>> which didn't work, and
>>>>> for o in xrange(25):
>>>>>     self.checkbox[''%d'%(o)] = ...
>>>>> which also didn't work.
>>>>> Both give the error message: "Attribute error: Main.App has no
>>>>> attribute "checkbox"", which clearly indicates that I'm not  
>>>>> keeping
>>>>> the "variability" aspect I want.
>>>>> Is there a way?
>>>> Keep either a list or dictionary around. Like this:
>>
>>>> checkboxes = []
>>
>>>> for o in xrange(25):
>>>>      checkboxes.append(....create a checkbox...)
>>
>>>> self.checkboxes = checkboxes
>>
>>>> Diez
>>
>>> I don't understand... how do I then complete the assignment  
>>> statement?
>>
>>> If I have:
>>
>>> self.checkbox1 = xrc.XRCCTRL(self.panel01, 'Checkbox1')
>>> .
>>> .
>>> .
>>> self.checkbox25 = xrc.XRCCTRL(self.panel01, 'Checkbox25')
>>
>>> using your method, wouldn't I still need to figure out my original
>>> question?
>>
>>> If I have a list of checkboxes, then I'll have:
>>
>>> checkboxes = [checkbox1, checkbox2 ... checkbox25]
>>
>>> in which case I'd still need to figure out how to get the  
>>> variable at
>>> the end of checkbox to do the rest of the "=" statement.
>>
>> I don't fully understand that. But if your code is uniform and looks
>> like the above, it appears that
>>
>> for o in xrange(25):
>>      checkboxes.append(xrc.XRCCTRL(self.panel01, 'Checkbox%i' % o))
>>
>> is the way to go.
>>
>> Diez
>
> Thank you, this is much closer to where I need to be...
>
> The issue is (and this is the part that you don't know, because I
> didn't tell you!) is that I later need to call methods on
> "self.checkbox1", for instance:
>
> self.checkbox1.GetValue()

self.checkbox[1].GetValue() is only two more characters and more  
readable, because it expresses that you have this list of checkboxes,  
where as "self.checkbox1" could be an odd name and all on its own, no  
others at all, etc.

Variable variable names are a good thing to avoid. Thats why we have  
containers.

>
> to determine if the box is checked or not.
>
> I should have included that piece in the initial problem description;
> my apologies.
> --
> http://mail.python.org/mailman/listinfo/python-list




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