Logical operation between two Boolean lists

Question

I get a weird result and I try to apply the and or the or operator to 2 Boolean lists in python. I actually get the exact opposite of what I was expec

Answer 1

Your lists aren't comparing each individual value, they're comparing the existence of values in the list.

For any truthy variables a and b:

a and b
> b #The program evaluates a, a is truthy, it evaluates b, b is truthy, so it returns the last evaluated value, b.
a or b
> a #The program evaluates a, a is truthy, so the or statement is true, so it returns the last evaluated value, a.

Now, truthy depends on the type. For example, integers are truthy for my_int != 0, and are falsy for my_int == 0. So if you have:

a = 0
b = 1
a or b
> b #The program evaluates a, a is falsy, so the or statement goes on to evaluate b, b is truthy, so the or statement is true and it returns the last evaluated value b.