python判断字符串包含关系

转自---http://blog.csdn.net/yl2isoft/article/details/52079960

1.使用成员操作符 in

>>> s='nihao,shijie'
>>> t='nihao' >>> result = t in s >>> print result True

2.使用string模块的find()/rfind()方法

>>> import string
>>> s='nihao,shijie' >>> t='nihao' >>> result = string.find(s,t)!=-1 >>> print result True >>> result = string.rfind(s,t)!=-1 >>> print result True 

3.使用string模块的index()/rindex()方法 
index()/rindex()方法跟find()/rfind()方法一样，只不过找不到子字符串的时候会报一个ValueError异常。

import string

def find_string(s,t): try: string.index(s,t) return True except(ValueError): return False s='nihao,shijie' t='nihao' result = find_string(s,t) print result #True

4.使用字符串对象的find()/rfind()、index()/rindex()和count()方法

>>> s='nihao,shijie'
>>> t='nihao' >>> result = s.find(t)>=0 >>> print result True >>> result=s.count(t)>0 >>> print result True >>> result=s.index(t)>=0 >>> print result True

参考链接：https://www.cnblogs.com/johnson-yuan/p/7910087.html