In article <mailman.14792.1413133694.18130.python-l...@python.org>,
Shiva <shivaji...@yahoo.com> wrote:
> Why is the second part of while condition not being checked?
>
> while ans.lower() != 'yes' or ans.lower()[0] != 'y':
> ans = input('Do you like python?')
>
>
> My intention is if either of the conditions are true the loop should break.
> But the condition after 'or' doesn't seem to evaluate.
A general rule of programming (be it Python or any other language) is to
break up complicated code into smaller pieces which can be understood
and tested in isolation. Your 'while' condition is kind of hairy.
There's a couple of complicated expressions, a logical conjuction, and
two different negated comparisons. That's a lot to understand all at
once.
I would factor that out into a little function:
-------------------------------------------------------
def is_yes(answer):
if answer.lower() == 'yes':
return True
if answer.lower()[0] == 'y':
return True
return False
while is_yes(ans):
ans = input('Do you like python?')
-------------------------------------------------------
Now, you can play around with your is_yes() function in an interactive
session and see what it returns for various inputs, in isolation from
the rest of your program:
print is_yes('y')
print is_yes('yes')
print is_yes('no')
print is_yes('you bet your sweet bippy')
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