True and False. I'm confused.

Question

a=6
b=7
print(8, not (a==7 and b==6))

print(9, not a==7 and b==6)

Why 8, is True?
Why 9 ,is False?
Both looks the same.

Answer 1

Nick ,

the difference of the 2 code samples is how the parenthesis are placed.

> in the first sample there is an additional pair of parenthesis used.

> in the second sample no additional parenthesis are used.

Stefanoo has given the details how the expressions are evaluated.

Answer 2

It's like math lessons. First parentheses then from left to right.
So in the first print statement we have:
not (a==7 and b==6)
not (false and false)
not (false)
true
And in the second print statement we have:
not a==7 and b==6
not false and false
true and false
false

Answer 3

Thank you so much. No more headaches.