Help me understand the meaning of the *not* keyword

Question

def func(num):
if num %2 == 0:
return True
else:
return False

print(not func(5))

The output I get is True. My question is just because it’s not 5 why doesn’t it mean it automatically is a 2 for the function to accept and return it as True. Can someone please explain the reason for this?

An analogy would be: just because my son didn’t tell the whole truth doesn’t necessarily mean that he lied.

Answer 1

If this is in the python language (which is certainly looks to be), the not statement simply inverts, or negates, the state of a boolean. For example, if the value of a boolean variable or expression is true, it will result in false. If true, false is the result.

For example:

(True) and (not(False)) -> (True) and (True) -> true

Answer 2

True==not False
False == not True