Multiplication Assignment Operator when variable is 0

Question

why the result of the following operation is always 0 in the Python REPL? (got the same results for C and Javascript)

>>> a = 0
>>> a *= 1 + 1
>>> a
0

Shouldn't the multiplication assignment be equivalent to a = a * 1 + 1 in the case above?

>>> a = 0
>>> a = a * 1 + 1
>>> a
1

Answer 1

because

a *= 1 + 1

is the same as

a = a *(1 + 1)

since a is 0 then the result is still 0