前面文章介绍的循环语句，这里开始介绍控制语句。直接看下面的demo.py例子
# 这里介绍 if语句
x = 5
y = 8
z = 4
s = 5
if x < y:
print(‘x is less than y‘)
if x < y > z:
print(‘x is less than y and greater than z‘)
if x <= s:
print(‘x is less than or equal to s‘)
原文：https://www.cnblogs.com/wangyinghao/p/10623209.html