判断字符串s1中是否包含字符串s2用，

可以使用Python中的in操作符来判断字符串s1是否包含字符串s2，示例如下：

s1 = "hello world"
s2 = "world"
if s2 in s1:
    print("s1 contains s2")
else:
    print("s1 does not contain s2")

输出结果为：s1 contains s2

如果不想区分大小写，可以先将两个字符串都转换为小写或大写，再进行判断，示例如下：

s1 = "Hello World"
s2 = "world"
if s2.lower() in s1.lower():
    print("s1 contains s2")
else:
    print("s1 does not contain s2")

输出结果为：s1 contains s2