bit calculation complement of x how it works?

Question

Can someone explain to me why:

print(~60) == -61?

because 60 is 111100 then reverse is 000011 and it should be 3?

Answer 1

Even assuming you are using one byte - 60 would be 0011 1100

So ~60 would be 1100 0011

i.e. -128 + 64 + 2 + 1 = =61