Python operator test error record 3

1.9//2 What is the output result of the expression?

4
注意：//为取整符，%为取余符

2. What is the output result?

x = True
y = False
z = False

if not x or y:
    print(1)
elif not x or not y and z:
    print(2)
elif not x or y or not y and x:
    print(3)
else:
    print(4)

3
注意：优先级顺序为 NOT、AND、OR。