r...@zedat.fu-berlin.de (Stefan Ram) writes:
> Julieta Shem <js...@yaxenu.org> writes:
>>clarify. If I wish for an empty stack, I wish I could just say
>>>>> Stack()
>>Stack()
>>and if I wish for a nonempty stack, I'd write
>>>>> Stack(1, Stack(2, Stack(3, Stack())))
>>Stack(1, Stack(2, Stack(3, Stack())))
>
> If this is all,
>
> main.py
>
> class Stack:
> def __init__( self, *args ):
> self.data = [ args[ 0 ], args[ 1 ]]if len( args ) else []
> def __str__( self ):
> if len( self.data ):
> return f"Stack({self.data[0]}, {self.data[1]})"
> else:
> return f"Stack()"
>
> print( Stack() )
>
> print( Stack(1, Stack(2, Stack(3, Stack()))) )
>
> output
>
> Stack()
> Stack(1, Stack(2, Stack(3, Stack())))
Thanks! But we've left behind a more basic requirement --- the Stack
class wishes for all the methods already written in some class called
Pair, which has a certain connection with a class Empty. This
requirement has been implicit in the first message in this thread,
though. I didn't make it explicit. (In other words, this part of the
thread only makes sense by taking into account all the previous messages
up in the thread.)
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