Why is 1<<3 + 1<<4 = 256?

Question

I thought it would be equal to 1<<7 == 128, but why is it equal to 1<<8 == 256? Could u please explain the algebra of x<<y + x<<z operations?

python interpreter

Answer 1

This is because of the python order of operations, where addition is evaluated before the left shift operator. The expression is equivalent to

(1<<(3+1))<<4