Discrepancy between C and Python when evaluating a boolean expression

Asked Feb 02 '19 at 20:32

Active Feb 02 '19 at 20:32

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Considering the code:

print( 1==2<3, (1==2)<3, 1==(2<3) )
False True True

I don't understand why the first expression 1==2<3 is evaluated to False. Precedence of <and == is the same and I guessed that in such a case expression is evaluated from left to right. But obviously, this is not the case.

Note that an equivalent C program evaluates all the three expressions to True.

asked Feb 02 '19 at 20:32

Nicolas Rougier

Thanks, I'm impressed you were able to find the duplicate from 7 years ago in less than a minute. – Nicolas Rougier Feb 02 '19 at 20:40
2

It becomes a habit if you see this kind of question often enough. – cs95 Feb 02 '19 at 20:47

Discrepancy between C and Python when evaluating a boolean expression

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