Tkinter __call__

[Gigs_]

James Stroud wrote:
> Gigs_ wrote:
>> James Stroud wrote:
>>> Gigs_ wrote:
>>>>     def printit(self, name):
>>>>         print name, 'returns =>', demos[name]()
>>>>
>>>>
>>>> I have tried but cant get it to work properly.
>>>> I want to instead printit method to put __call__ and call it like that
>>>> Can someone help me, please?
> 
>> I understand lambda, and I know that code is working. But want to do 
>> for exercise with __call__. This coed is from programming python 2ed boo
> 
> You want to use a function factory that itself defines "__call__"? This 
> requires creating a class and not a function.
> 
> 
> class printit(object):
>   def __init__(self, name):
>     self.name = name
>   def __call__(self):
>     print self.name, 'returns =>', demos[self.name]()
> 
> class Demo(Frame):
>     def __init__(self, parent=None):
>         Frame.__init__(self, parent)
>         self.pack()
>         Label(self, text="Basic demos").pack()
>         for (key, value) in demos.items():
>             func = printit(key)
>             Button(self, text=key, command=func).pack(side=TOP, fill=BOTH)
> 
> 
> However, the functional way (as with lambda) is the most widely used way 
> to do this. Another functional way is with closure:
> 
> def printit(key):
>   def _f():
>     print key, 'returns =>', demos[key]()
>   return _f
> 
> Which behaves identically to the class above. Even more ways to do this 
> exist in python, including partial functions--which are also a 
> functional approach.
> 
> James

thanks man