Python中endswith()函数的基本使用
函数:endswith()
作用:判断字符串是否以指定字符或子字符串结尾,常用于判断文件类型
相关函数:判断字符串开头 startswith()
一、函数说明
语法:string.endswith(str, beg=[0,end=len(string)])
string[beg:end].endswith(str)
参数说明:
string: 被检测的字符串
str: 指定的字符或者子字符串(可以使用元组,会逐一匹配)
beg: 设置字符串检测的起始位置(可选,从左数起)
end: 设置字符串检测的结束位置(可选,从左数起)
如果存在参数 beg 和 end,则在指定范围内检查,否则在整个字符串中检查
返回值:
如果检测到字符串,则返回True,否则返回False。
解析:如果字符串string是以str结束,则返回True,否则返回False
注:会认为空字符为真
二、实例
>>> s = 'hello good boy doiido' >>> print s.endswith('o') True >>> print s.endswith('ido') True >>> print s.endswith('do',4) True >>> print s.endswith('do',4,15) False
#匹配空字符集 >>> print s.endswith('') True #匹配元组 >>> print s.endswith(('t','b','o')) True
常用环境:用于判断文件类型(比如图片,可执行文件)
>>> f = 'pic.jpg' >>> if f.endswith(('.gif','.jpg','.png')): print '%s is a pic' %f else: print '%s is not a pic' %f pic.jpg is a pic

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