Question

Quick question regarding a Boolean operation:

If I want to establish the condition that R!= #1 or #2 or #3...etc. What would be the syntax for that? I tried to do R!= (a or b or c or d) but seems like that's completely wrong... Could somebody please help me? Thank you!

Answer 1

not sure what you mean by "establish the condition" ... maybe assert?
and it's just style, but R! is a horrible name for anything, lose the punctuation
if you are checking a condition, (a or b or c or d) is perfectly valid
but if you don't like that, and you have sets to play, try R in [a,b,c,d]

Answer 2

Hi philips13:

Thanks for responding. What I meant is that I want to write a code that says 'R does not equal to a or b or c or d'. So would "R != a or b or c or d" work?

Answer 3

Yes, but be careful and check the truth table.
Do you want to make sure they are all false? If so, that's it.
and another style point:
If this check is only used once, there is no need to set a variable, and it usually makes it a lot more readable and easier to maintain.
while not (a or b or c or d) ...
if not (a or b or c or d) ...
return not (a or b or c or d) ...

Answer 4

not in is a good idiom
http://dpaste.com/729349/

Answer 5

yes, I forgot this was Python, tried to stay generic