1.算术运算
+ - * /
// —— 结果取整
% ——取余
** —— 幂
2.数学函数
round（）—— 四舍五入
abs（）——绝对值
import math ——引入math模块
https://www.cnblogs.com/MingleYuan/p/10628503.html
3.if语句
price = 1000000 has_good_credit = True if has_good_credit: down_payment = 0.1 * price else: down_payment = 0.2 * price print(f"Down payment :{down_payment}")