Class Definitions
Manfred Lotz
ml_news at posteo.de
Sat Nov 14 04:09:32 EST 2020
On 11 Nov 2020 19:21:57 GMT
ram at zedat.fu-berlin.de (Stefan Ram) wrote:
> In my Python course I gave the assignment to define a
> counter class "Main" so that
>
> counter0 = Main()
> counter1 = Main()
> counter1.count(); counter1.count(); counter1.count()
> counter1.count(); counter1.count()
> print( counter0.value )
> print( counter1.value )
>
> would print
>
> 0
> 5
>
> .
>
> I expected this solution:
>
> class Main:
> def __init__( self ):
> self.value = 0
> def count( self ):
> self.value += 1
>
> but a student turned in the following solution:
>
> class Main:
> value = 0
> def count(self):
> self.value += 1
>
> .
I am still a Python beginner and didn't even believe that the student's
solution would work. I had expected an error as the instance variable
self.value was not initialized.
--
Manfred
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