下面是将以上四个步骤整合在一起的完整代码示例: defindex_of_substring(string,substring):string_list=list(string)forindex,charinenumerate(string_list):ifchar==substring[0]:# 判断当前字符是否与子字符串的第一个字符相同ifstring[index:index+len(substring)]==substring:# 判断当前字符后续字符是否与子字符...
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 3,count,len count用来统计某元素出现的次数,len用来计算字符串的长度: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 str...
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] ...
substring：要查找的子字符串。start（可选）：开始查找的起始位置，默认为 0。end（可选）：结束查找的位置，默认为字符串的长度。示例：1. 查找子字符串：text = "Hello, world! This is an example."# 使用 find 查找子字符串index = text.find("world")print("Index of 'world':", index) # 输出...
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 substring ...
A substring is the part of a string. Python string provides various methods to create a substring, check if it contains a substring, index of substring etc. …
print(text.index("world")) # 输出: 7 print(text.index("o", 5)) # 输出: 8,从索引5开始搜索'o' try: print(text.index("Python")) # 将引发 ValueError except ValueError as e: print(e) # 输出: substring not found 在列表中使用 index() numbers = [1, 2, 3, 4, 3, 5] print(...
The index method can’t return a number because the substring isn’t there, so we get a value error instead: In order to avoid thisTraceback Error, we can use the keywordinto check if a substring is contained in a string. In the case of Loops, it was used for iteration, whereas in...
# 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. ...
If tabsize is not given, a tab size of 8 characters is assumed. """ pass def find(self, sub, start=None, end=None): # real signature unknown; restored from __doc__ """ S.find(sub[, start[, end]]) -> int Return the lowest index in S where substring sub is found, ...