On Mon, Oct 13, 2014 at 4:21 AM, Shiva
<shivaji...@yahoo.com.dmarc.invalid> wrote:
>> The loop will continue while either part is true - that's what "or"
>> means. Is that what you intended it to be doing?
>>
>> ChrisA
>>
>
>
> Yes......however, the second part of the or condition doesn't get evaluated.
> So if I enter a 'y' - I expect the second part to evaluate and the loop to
> break - but that doesn't seem to happen.
Break it down into separate parts and have a look at what's happening.
while ans.lower() != 'yes' or ans.lower()[0] != 'y':
ans = input('Do you like python?')
print("ans.lower() = {!r}; first cond = {!r}, second cond {!r},
disjunction {!r}".format(
ans.lower(), (ans.lower() != 'yes'), (ans.lower()[0] != 'y'),
(ans.lower() != 'yes' or ans.lower()[0] != 'y')
))
The while loop will continue so long as the disjunction is True. See
what it's actually doing.
This is fundamental Boolean logic, a basic skill of programming.
You're going to need to master this. Look at the different pieces, and
get your head around what the 'or' operator actually does.
ChrisA
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