Programming Forums > Script Programming > Python

Dunganb · Jun 14th, 2008, 11:06 PM

Hey everyone,

I was reading through a tutorial for Python on wikibooks and got hung up at a spot about short circuiting. I was wondering if you could help me through the logic the program is using to return the results. Here is the input/output:

 python Syntax (Toggle Plain Text) 
>>> 'a' == ('a' or 'b')
True
>>> 'b' == ('a' or 'b')
False
>>> 'a' == ('a' and 'b')
False 
>>> 'b' == ('a' and 'b')
True
>>> 'a' == ('a' or 'b')
True
>>> 'b' == ('a' or 'b')
False
>>> 'a' == ('a' and 'b')
False 
>>> 'b' == ('a' and 'b')
True

The second and fourth ones are the ones I am having trouble understanding. From what I read on wikibooks, it has something to do with the first and second strings being non-empty strings, but I couldn't really see how writing the previous example is different from the following:

 python Syntax (Toggle Plain Text) 
>>> 'a' == 'a' or 'a' == 'b'
True
>>> 'b' == 'a' or 'b' == 'b'
True
>>> 'a' == 'a' and 'a' == 'b'
False
>>> 'b' == 'a' and 'b' == 'b'
False
>>> 'a' == 'a' or 'a' == 'b'
True
>>> 'b' == 'a' or 'b' == 'b'
True
>>> 'a' == 'a' and 'a' == 'b'
False
>>> 'b' == 'a' and 'b' == 'b'
False

Am I just missing something here?

titaniumdecoy · Jun 15th, 2008, 3:27 PM

Perhaps this will help.

Dunganb · Jun 15th, 2008, 5:32 PM

Thanks titaniumdecoy, that article answered a lot of the areas where I was confused.

Jun 14th, 2008, 11:06 PM	#1
Dunganb Newbie Join Date: Jun 2008 Location: Pennsylvania Posts: 5 Rep Power: 0	Short circuiting... Hey everyone, I was reading through a tutorial for Python on wikibooks and got hung up at a spot about short circuiting. I was wondering if you could help me through the logic the program is using to return the results. Here is the input/output: python Syntax (Toggle Plain Text) >>> 'a' == ('a' or 'b') True >>> 'b' == ('a' or 'b') False >>> 'a' == ('a' and 'b') False >>> 'b' == ('a' and 'b') True >>> 'a' == ('a' or 'b') True >>> 'b' == ('a' or 'b') False >>> 'a' == ('a' and 'b') False >>> 'b' == ('a' and 'b') True The second and fourth ones are the ones I am having trouble understanding. From what I read on wikibooks, it has something to do with the first and second strings being non-empty strings, but I couldn't really see how writing the previous example is different from the following: python Syntax (Toggle Plain Text) >>> 'a' == 'a' or 'a' == 'b' True >>> 'b' == 'a' or 'b' == 'b' True >>> 'a' == 'a' and 'a' == 'b' False >>> 'b' == 'a' and 'b' == 'b' False >>> 'a' == 'a' or 'a' == 'b' True >>> 'b' == 'a' or 'b' == 'b' True >>> 'a' == 'a' and 'a' == 'b' False >>> 'b' == 'a' and 'b' == 'b' False Am I just missing something here?

Jun 15th, 2008, 3:27 PM	#2
titaniumdecoy Expert Programmer Join Date: Nov 2005 Posts: 855 Rep Power: 3	Re: Short circuiting... Perhaps this will help.

Jun 15th, 2008, 5:32 PM	#3
Dunganb Newbie Join Date: Jun 2008 Location: Pennsylvania Posts: 5 Rep Power: 0	Re: Short circuiting... Thanks titaniumdecoy, that article answered a lot of the areas where I was confused.

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Programming Forums > Script Programming > Python

Short circuiting...