用Python不調用庫函數直接實現二進制的轉化

如題，話不多說，直接上代碼

#!D:/workplace/python
# -*- coding: utf-8 -*-
# @File  : 二進制中1的個數.py
# @Author: WangYe
# @Date  : 2019/6/19
# @Software: PyCharm

def NumberOf1(n):
    # write code here
    list1 = []
    if n >= 0:
        shang = n
        while shang:
            yushu, shang = key(shang)
            list1.append(yushu)
        cishu = 0
        for k in list1:
            if k == 1:
                cishu = cishu + 1
        list1.reverse()
        print(list1)


def key(num):   #求除以2之後的餘數和商
    shang = int(num / 2)
    yushu = num - (shang * 2)
    return yushu, shang

#
# def change(num, up):
#     num = num + up
#     if num == 2:
#         return [0, 1]
#     else:
#         return [num, 0]

NumberOf1(10)

結果截圖：