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Logical Operators, Seemingly Illogical Behavior
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And now an example that contains both
and and or:>>> 1 or 0 and 1/0 or 2
And this statement gets tricky to comprehend! Here's the core idea: the
and operator takes precedence over the or operator.In simpler English, what this means is that the statement looks something like this:
>>> 1 or (0 and 1/0) or 2
This statement first evaluates
1, finds it to be a truthy value, and immediately returns it. This is why the 1/0 doesn't throw an error.Try this one yourself:
>>> 0 or None and 1/0 or 2
Now that you've given this a shot, let's walk through it together!
>>> 0 or None and 1/0 or 2
>>> 0 or (None and 1/0) or 2
First, the
or statement evaluates 0. Finding it to be a false-y value, it keeps going. It evaluates (None and 1/0) next. In this, the and finds None to be the first false-y value, and immediately returns it. The outer or statements sees None as the next value, and keeps going. It therefore returns 2, the first truth-y value it finds! Last modified 1yr ago