How a single parenthesis could change the output?

Question

print(3 in [1, 2, 3] == [1, 2, 3])
#Output: True 

print((3 in [1, 2, 3]) == [1, 2, 3])
#Output: False

I'm just wondering what is happening here.

Answer 1

Because of Python's comparison chaining feature.

3 in [1, 2, 3] == [1, 2, 3]

is treated as

(3 in [1, 2, 3]) and ([1, 2, 3] == [1, 2, 3])