deffind_substrings(string,substrings):positions=[]forsubstringinsubstrings:index=string.find(substring)positions.append(index)returnpositions# 示例用法string="This is a test string."substrings=["is","test","string"]positions=find_substrings(string,substrings)print(positions)# 输出:[2, 10, 17] ...
Theindex()method is used to find the index of the first occurrence of a specified element in a list. This method is particularly useful when you need to know the position of a specific element within a list. Here’s an example of how to use theindex()method to find the index of the...
importrestr="Hello, world!"char="o"pattern=re.compile(char)match=pattern.search(str)ifmatch:index=match.start()print(f"The index of{char}is{index}")else:print(f"Cannot find{char}in the string") 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 输出结果为: The index of o is 4 1. 方法...
Strings can beconcatenatedto build longer strings using the plus sign and also they can bemultipliedby a number, which results in the continuous repetition of the string as many times as the number indicates. Also, if we want to find out thelengthof the string, we simply have to use thelen...
# find the index of isresult = text.index('is') print(result)# Output: 7 index() Syntax It's syntax is: str.index(sub[, start[, end]] ) index() Parameters Theindex()method takes three parameters: sub- substring to be searched in the stringstr. ...
index(str2); s.find(sub [,start [,end]]) -> int 检测 sub 是否包含在 string 中,如果 start 和 end 指定范围,则检查是否包含在指定范围内,如果是返回开始的索引值,否则返回-1 s.rfind(sub [,start [,end]]) -> int 右边开始查找.返回字符串最后一次出现的位置(从右向左查询),如果没有匹配项...
Python String find() The find() method returns the lowest index of the substring if it is found in given string. If its is not found then it returns -1. Syntax : str.find(sub,start,end) Parameters : sub :It’s the substring which needs to be searched in the given string....
今天给大家说下python字符串的find方法,从python的文档里可以知道find方法是查找子串在字符串的开始位置。看下文档解释:string.find(s, sub[, start[, end]]) Return the lowest index in s where the substrin
find() Return Value Thefind()method returns an integer value: If the substring exists inside the string, it returns the index of the first occurence of the substring. If a substring doesn't exist inside the string, it returns-1. Working of find() method ...
find()回报-1 和index()加薪ValueError。使用 find()>>> myString = 'Position of a character'>>...