[Tutor] AttributeError: instance has no __call__ method

[Juan Shen]

Juan Shen wrote:

> Marc Gartler wrote:
>
>> Hi everybody,
>>
>> Prior to this chunk of code 'glass' has been chosen from a list of 
>> colors via user input, and I now want to have that choice connect to 
>> one of several possible classes:
>>
>> def glass_type(glasstype):
>>     if glasstype == 'Red':
>>         myglass = RedGlassCost()
>>     elif glasstype == 'Blue':
>>         myglass = BlueGlassCost()
>>     elif glasstype == 'Yellow':
>>         myglass = YellowGlassCost()
>>     return myglass
>>
>> glasschoice = glass_type(glass)
>> myglass = glasschoice()
>>
>>
>> I've tried various approaches and keep getting different errors.  But 
>> this one seems closest to my goal, as I know it is at least passing 
>> 'glass' into the function:
>>
>> AttributeError: RedGlassCost instance has no __call__ method
>>
>> What is this trying to tell me?  Or is that irrelevant as I would be 
>> better off trying some other approach altogether?
>>
>> _______________________________________________
>> Tutor maillist  -  Tutor at python.org
>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
> I have guessed your meaning by that code.  Try the following:
>
> glasstype={\
> 'Red':RedGlassCost,\
> 'Blue':BlueGlassCost,\
> 'Yellow':YellowGlassCost}
> # RedGlassCost ... are types.FunctionType
> myglass=glasstype[glass]()
>
BTW, if RedGlassCost is types.ClassType, my code also sounds.
    Juan Shen