Python: How does python executes multiple boolean in one statement?

Question

With following condition, what should Python return? In which sequence the condition will get executed?

True or False and False and True

score 3 · Answer 1 · answered Sep 21 '18 at 18:04

3

AND has a higher precedence than OR.

True or False and False and True -> True or TRUE and True -> True or TRUE -> TRUE.

answered Sep 21 '18 at 18:04

Dean Dumitru

Can you please explain bit more that in your first step, how did you derive -> True or True and True? As you previously mentioned that AND has a higher precedence hence my original question can be treated in either way as follows; True or (False and False) and True or True or False and (False and True) – Vivek Sep 21 '18 at 18:32
False and False is equal to False with a logical conjunction (AND); look here: https://en.wikipedia.org/wiki/Logical_conjunction – toom501 Sep 21 '18 at 18:33
1

The expression will be executed from left to right in the order of operators precedence. As @toom501 said below. I personally always use () when combining them. – Dean Dumitru Sep 21 '18 at 18:35
2

Also might want to note that in this example it'll actually short-circuit after seeing `True or` and return True regardless of what follows the `True or` – natonomo Sep 21 '18 at 20:31

score 1 · Accepted Answer · answered Sep 21 '18 at 18:32

Like @Dean Dumitru has said and like it said in this answer here; the AND has a higher precedence than OR.

Hence, your condition could be rewritten in this way:

True or ((False and False) and True) -> True or (False and True) -> True or False -> TRUE

2 Answers2