print str[0:3] #截取第一位到第三位的字符 print str[:] #截取字符串的全部字符 print str[6:] #截取第七个字符到结尾 print str[:-3] #截取从头开始到倒数第三个字符之前 print str[2] #截取第三个字符 print str[-1] #截取倒数第一个字符 print str[::-1] #创造一
rfind(substring, start, end) 从右侧开始查找子字符串,并返回索引 rindex(substring, start, end) 从右侧开始查找子字符串,并返回索引(无匹配时引发异常) rjust(width, fillchar) 返回一个指定宽度的右对齐字符串,左侧填充指定字符 rpartition(separator) 根据指定的分隔符将字符串分成三部分(从右边开始) r...
find(s, *args) find(s, sub [,start [,end]]) -> in 寻找字符串从start到end间,sub是否出现过。出现过则返回出现的位置,否则返回-1 index(s, *args) index(s, sub [,start [,end]]) -> int 寻找字符串从start到end间,sub是否出现过。出现过则返回出现的位置,否则报错 join(words, sep=' ')...
"Python","HaHa",sep='&',end='😢')#Hello world&Python&HaHa😢#注意:如果直接输出字符串,而不是用对象表示的话,可以不使用逗号print("Hello world""Python""HaHa",sep='*',end='😅')#Hello worldPythonHaHa😅#输出多个变量a = 1b= 2c= 3print(a,b,c,sep='%...
Replace(old,new) replaces the old occurrence of the substring old with the substring new. Find() reports the offset where the first occurrence of the substring occurs. >>> banner = “FreeFloat FTP Server” >>> print banner.upper() FREEFLOAT FTP SERVER >>> print banner.lower() freefloat...
index("n", 5, 13)) ^^^ ValueError: substring not found 0 11 -1 0 (2)检索字符串包含目标字符串的次数 count 函数用于查找目标字符串在另一字符串中出现的次数,指定 start 和 end 的范围(顾头不顾尾),如果检索的字符串不存在,则返回 0,否则返回出现的次数,语法格式为:str.count(sub, start, end...
end —— 索引的结束位置,默认为字符串的长度。 示例: "I love python".rindex('o')11"I love python".index('o')3"I love python".rindex('k')ValueError: substring not found"I love python".rfind('k')-1 五、字符串格式化 17、format() ...
text="Python is a powerful programming language"sub_string="programming"match=re.search(sub_string,text)ifmatch:start_index=match.start()end_index=match.end()print(f"The substring '{sub_string}' is found from index{start_index}to{end_index}")else:print(f"The substring '{sub_string}' is...
python没有substring函数,因为直接使用str[start:end]就可以啦。字母处理 全部大写:str.upper()全部小写:str.lower()大小写互换:str.swapcase()首字母大写,其余小写:str.capitalize()首字母大写:str.title()print '%s lower=%s' % (str,str.lower())...
.rstrip([chars]) Trims the string by removing chars from the end .removeprefix(prefix, /) Removes prefix from the beginning of the string .removesuffix(suffix, /) Removes suffix from the end of the string .replace(old, new [, count]) Returns a string where the old substring is replaced...