not in python syntax code example

Example 1: not in python

x = 10
if not x:
    print("True")
else:
    print("False")

Example 2: //= python meaning

#Performs floor-division on the values on either side. Then assigns it to the expression on the left.
>>> a=6
>>> a//=3
>>> print(a)
2

Example 3: x and y in python

x + y = 19
x - y = 11
x * y = 60
x / y = 3.75
x // y = 3
x ** y = 50625