passing arguments from scale widget to function

m7b52000 tpearce at internode.on.net
Mon Aug 22 13:16:01 CEST 2005


Matt Hammond wrote:
> On Sun, 21 Aug 2005 08:09:55 +0100, m7b52000 
> <oh_no_you_don't at noSPAM.com>  wrote:
> 
>> It is proving most difficult in Python. How do I pass the .get() 
>> values  to my calculating function? Do I use the command option for 
>> each slider?  e.g command = Calc(a.get()). Obviously not cos it 
>> doesn't work.
> 
> 
> It should work if you wrap it as a lambda function. As it is, you're  
> assigning the
> result of the Calc() function to the 'command' argument/parameter of 
> the  slider widget. What you actually want is to assign just the function:
> 
>    command = lambda : Calc(a.get())
> 
>> I am not a real programmer and do not wish to get involved in classes  
>> and objects....
> 
> 
> If you're using Tcl/Tk you're already using them ... what do you think  
> your Slider widget is? :-)
> 
> Hope this helps!
> 
> regards
> 
> 
> Matt
Thanks,

I get the following message when I use lambda as above:

TypeError: <lambda>() takes no arguments (1 given)

any other thoughts :)

Tony



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