difference between not i==j and i is not j

Asked Apr 02 '13 at 07:09

Active Apr 02 '13 at 07:11

Viewed 48 times

i was creating this program which checks whether 2 items on a list add up to a certain amount of credits i have however each item should be counted only once..

the first part was giving me the correct solution while the second one was executing some cases twice..

so what exactly would the difference between 'not e==j' and 'e is not j' be?

for j in range(len(prices)):
    for e in range(j,len(prices)):
        if(int(prices[j])+int(prices[e])==creds and (not e==j)):
            if(j<e):
                    something
            else:
                    something

for j in range(len(prices)):
    for e in range(j,len(prices)):
        if(int(prices[j])+int(prices[e])==creds and (e is not j)):
            if(j<e):
                    something
            else:
                    something

edited Apr 02 '13 at 07:11

Martijn Pieters

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asked Apr 02 '13 at 07:09

otaku

3

And you'd use `!=` as the negative to `==`. – Martijn Pieters Apr 02 '13 at 07:10
@MartijnPieters or `<>` if you are even more crazy – jamylak Apr 02 '13 at 07:21

difference between not i==j and i is not j

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