[Tutor] Re: Logic error / poor understanding of classes?

[Liam Clarke]

Erm... logic error. 

<embarassing logic error>

Please disregard this post, or use it to warn others of the danger of
coding while caffeine deprived.

when I loaded self.sortSetting, I forgot to add int() around it... *sigh*


On Tue, 30 Nov 2004 23:26:03 +1300, Liam Clarke <cyresse at gmail.com> wrote:
> Hi all,
> 
> Having an issue... creating a couple of methods in a class, and
> hitting a strange error.
> 
> def genWin(self):
>         self.Show(0)
> 
>         #Get dict vals of CM's and teams as (name, team) tuple
>         tuplesToGen=self.sortAndTuple()
>         print 'z point'
>         print tuplesToGen
> 
>     def sortAndTuple(self):
>         listOTuples=self.cmList.items()
>         print listOTuples
>         print 'List presort'
>         print self.sortSetting
> 
>         if self.sortSetting == 0:
>             print 'x point'
>             listOTuples.sort()
>             print 'y point'
>             print listOTuples
>             return listOTuples
> 
>         elif self.sortSetting == 1:
>             schwartzList = [ (item[1],item) for item in listOTuples ]
>             schwartzList.sort()
>             listOTuples  = [ item[1] for item in schwartzList ]
>             print'No, wrong'
>             return listOTuples
> 
> So this is within a class, and genWin calls sortAndTuple() to sort the
> list by alphabetical order of either value.
> 
> So, self.sortSetting is 0, so it should sort alphabetically... this is
> the console output I get -
> 
> [('Carla', 'ECM'), ('Dave', 'ABC') <etc. etc.> ]
> List presort
> 0
> z point
> None
> 
> So my expected list of tuples is fine, and self.sortSetting is 0, as
> it should be...
> 
> but, what happened to 'x' point and 'y' point? And also, why is my
> method returning None?
> self.sortSetting is not 0?
> 
> If I replace
> 
>  elif self.sortSetting == 1:
> 
> with else:
> 
> it runs that clause fine, so what am I doing wrong? Oh, and if I place a
> print self.sortSetting command in the else clause, it prints zero...
> 
> So, I know what the problem is, just not why it's happening.
> It is generating no error message for a missing var,  and I'm sure
> it's a quirk of classes or (more likely) my limited knowledge.
> 
> Can you not return values from one method to another in a class? Or,
> am I missing something like passing the calling function as a
> parameter i.e.
> 
> tuplesToGen=self.sortAndTuple(self)
> 
> or should I be passing self.sortSetting as an argument? I think I'm
> treating it as a global variable at the moment.
> 
> Regards,
> 
> (a Confused) Liam Clarke
> --
> 'There is only one basic human right, and that is to do as you damn well please.
> And with it comes the only basic human duty, to take the consequences.
> 


-- 
'There is only one basic human right, and that is to do as you damn well please.
And with it comes the only basic human duty, to take the consequences.