Re: [Tutor] Lots of variables

[Alan G]

 I am trying to write a gui that has a lot of checkboxes. It is over 
 200
 different ones. I use a for statement to generate:

ver = 200
for i in ['Car','House','Boat','Plane']:
self.fra26_che01p = Checkbutton (self.fra26)
self.fra26_che01p.place(in_=self.fra26,x=5,y=ver)
self.fra26_che01p.configure(text=i)

 The variable does not work for obvious reasons. I need to change 
 variable
 for each new creation. If I had made the variables manually, I would 
 have

Try a dictionary using the strings in your list as the keys and the
controls as the values.

See the bank account example in my OOP topic for an example.

Alan G
Author of the Learn to Program web tutor
http://www.freenetpages.co.uk/hp/alan.gauld 

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[Tutor] Lots of variables

[Øyvind]

Hello.

I am trying to write a gui that has a lot of checkboxes. It is over 200
different ones. I use a for statement to generate:

ver = 200
for i in ['Car','House','Boat','Plane']:
self.fra26_che01p = Checkbutton (self.fra26)
self.fra26_che01p.place(in_=self.fra26,x=5,y=ver)
self.fra26_che01p.configure(text=i)
self.getattr(self,i)1 = IntVar()
self.fra26_che01p.configure(variable=getattr(self,i))
self.fra26_che01v = Checkbutton (self.fra26)
self.fra26_che01v.place(in_=self.fra26,x=70,y=ver)
#self.fra26_che01v.configure(text=1p)
self.getattr(self,i)2 = IntVar()
self.fra26_che01v.configure(variable=getattr(self,i))
ver = ver + 17

The variable does not work for obvious reasons. I need to change variable
for each new creation. If I had made the variables manually, I would have
written (variable=self.car1)/(variable=self.car2) and so forth. Is there
some way I can make lots of variables without declaring them up front?

Thanks in advance

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Re: [Tutor] Lots of variables

[Kent Johnson]

Øyvind wrote:
 Hello.
 
 I am trying to write a gui that has a lot of checkboxes. It is over 200
 different ones. I use a for statement to generate:
 
 ver = 200
 for i in ['Car','House','Boat','Plane']:
 self.fra26_che01p = Checkbutton (self.fra26)
 self.fra26_che01p.place(in_=self.fra26,x=5,y=ver)
 self.fra26_che01p.configure(text=i)
 self.getattr(self,i)1 = IntVar()
 self.fra26_che01p.configure(variable=getattr(self,i))
 self.fra26_che01v = Checkbutton (self.fra26)
 self.fra26_che01v.place(in_=self.fra26,x=70,y=ver)
 #self.fra26_che01v.configure(text=1p)
 self.getattr(self,i)2 = IntVar()
 self.fra26_che01v.configure(variable=getattr(self,i))
 ver = ver + 17
 
 The variable does not work for obvious reasons. I need to change variable
 for each new creation. If I had made the variables manually, I would have
 written (variable=self.car1)/(variable=self.car2) and so forth. Is there
 some way I can make lots of variables without declaring them up front?

The usual way to do this is to keep a dictionary mapping the 'variable' names 
to the values, or maybe just a list of the values. Since you access the 
checkbuttons through IntVars you may not need to keep a reference to the button 
itself. So maybe something like this:

self.vars = {}
ver = 200
for i in ['Car','House','Boat','Plane']:
check1 = Checkbutton (self.fra26)
check1.place(in_=self.fra26,x=5,y=ver)
check1.configure(text=i)
var1 = self.vars[i+'1'] = IntVar()
check1 .configure(variable=var1)
check2 = Checkbutton (self.fra26)
check2.place(in_=self.fra26,x=70,y=ver)
var2 = self.vars[i+'2'] = IntVar()
check2.configure(variable=var2)
ver = ver + 17

Now self.vars will have entries for 'Car1', 'Car2', etc. whose values will be 
the corresponding IntVars.

Kent

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