[Tutor] problem with a sub-class

[Sydney Shall]

On 30/11/2017 22:08, Alan Gauld via Tutor wrote:
> On 30/11/17 15:37, Shall, Sydney wrote:
> 
>> My problem is with constructing a sub-class.
>>
>> My sub-class is constructed as follows:
>>
>> import Population_ProductivityV24 as POCWP
> 
> Note that POCWP is an alias for the *module* Population_ProductivityV24.
> It is not a class.
> 
>> line 27 : class SimulateCycleZero(POCWP):
> 
> Here you define a class that subclasses your imported module.
> Frankly I'm surprised that you don't get an error there
> but hey...
> 
>> line 28 :     def __init__(self, dirname_p):
> 
> But this is now an init for a subclass of module.
> 
>> The error message is as follows:
>>
>>     File
>> "/Users/sydney/AnacondaProjects/Capital/Capital_with_productivity/Current_Versions/Simulate_Cycle_Zero_V3.py",
>> line 27, in <module>
>>       class SimulateCycleZero(POCWP):
>>
>> TypeError: module.__init__() takes at most 2 arguments (3 given)
> 
> So I'm guessing the use of a module to subclass
> has confused things and I confess I'm not clear on
> exactly what is going on and why you get this message.
> But I'm pretty sure you don;t want to subclass your
> imported module and thats the mistake.
> 
> 

Thanks to Alan and Peter for explaining sub-classing to me. I understand 
a bit better now. My program is corrected and does not give the error 
any more.


-- 
Sydney