While loop with "or"? Please help!

[Bruno Desthuilliers]

Peter Otten a écrit :
> Bruno Desthuilliers wrote:
> 
>> and simplified again thanks to Python 'in' operator:
>> while not usrinp.lower() in "yn":
> 
> But note that 'in' performs a substring search and therefore "yn" and ""
> would be accepted as valid answers, too.

Mmm, right. Thanks for the correction.

=>
   while not usrinp.lower() in ['y', 'n']: