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] ...
Write a Python program to determine the index of a given string at which a certain substring starts. If the substring is not found in the given string return 'Not found'. Sample Solution: Python Code: # Function to find index of substringdeffind_Index(str1,pos):# Check if pos longer ...
find() function count() functionto find the number of occurrences of a substring in the string. s = 'My Name is Pankaj' print('Substring count =', s.count('a')) s = 'This Is The Best Theorem' print('Substring count =', s.count('Th')) Output: Find all indexes of substring Th...
首先,我们需要定义一个名为String的类,该类将包含一个名为indexOf的方法。以下是实现的代码示例: classString:def__init__(self,value):self.value=valuedefindexOf(self,substring):returnself.value.find(substring) 1. 2. 3. 4. 5. 6. 在这个类中,我们首先定义了一个构造函数__init__,它接受一个字符...
# find the index of isresult = text.index('is') print(result)# Output: 7 Run Code 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. ...
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....
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 ...
in <module>ValueError: substring not found从Python手册string.find(s, sub[, start[, end]])返回s...
python 自带的两个查找字符串的方法:find 和rfind. Python String find() Method Description: This method determines ifstroccurs in string, or in a substring of string if starting indexbegand ending indexendare given. beg 和 end 可以缺省,这样find整个字符串 ...
2,index 代码语言:javascript 复制 s="你好,世界!"#使用index()方法获取字符串中指定字符的索引 index_of_char=s.index('好')print(index_of_char)# 输出:1#使用index()方法获取字符串中指定子串的索引 index_of_substring=s.index('你好')print(index_of_substring)# 输出:0 ...