Prove safety offer binary number of python 1

Title Description

An integer that indicates the number of the output of the binary number 1 in. Wherein a negative number indicates a complement.

Thinking

And itself after a different number may be 1 or eliminate rightmost 1

Code

# - * - Coding: UTF-. 8 - * - 
class Solution:
     DEF NumberOf1 (Self, n-):
         #   erase a rightmost. 1 
        COUNT = 0
         IF n-< 0: 
            n- = n-0xFFFFFFFF &
         the while n-: 
            n- = ( n--. 1) & n- 
            COUNT + =. 1
         return COUNT