Assigns values

x=y

Adds the right operand to the left operand and assigns the result to the left operand

x +=y (same as x = x+y)

Subtracts the right operand from the left operand and assigns the result to the left operand

y -=x (same as y=y-x)

Multiplies the right operand by the left operand and assigns the result to the left operand

x *= a (same as x = x * a)

Divides the left operand by the right operand and assigns the result to the left operand

x /= a (same as x = x / ax) 

Performs a modulus on operators and assigns the result to the left operand

x %= a (same as x = x % a)

Performs an exponential (power) calculation on operators and assigns the result to the left operand

x **= a (same as x = x ** a)