X and Y or Z - ternary operator

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In Java or C we have <condition> ? X : Y, which translates into Python as X if <condition> else Y.

But there's also this little trick: <condition> and X or Y.

I know that it is equivalent to the aforementioned ternary operators, but I find it difficult to grasp how and or operators are able to produce the correct result. Can anyone explain the logic?
May 23, 2019 in Python by ana1504.k
• 7,910 points

1 answer to this question.

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According to the docs:

The expression x and y first evaluates x; if x is false, its value is returned; otherwise, y is evaluated and the resulting value is returned.

The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and the resulting value is returned.

So, True and 0 or 1 evaluates the first argument of the and operator, which is True. Then it returns the second argument, which is 0.

Since the True and 0 returns false value, the or operator returns the second argument (i.e. 1)
answered May 23, 2019 by SDeb
• 13,290 points

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