AI检测代码解析 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串匹配returnindexreturn-1 1. 2....
Theindexmethod in particular, returns the index of the given substring, inside the string.The substring that we pass, can be as long or as short as we want.And what happens if the string doesn’t have the substring we’re looking for?The index method can’t return a number because the...
If substring exists inside the string, it returns the lowest index in the string where substring is found. If substring doesn't exist inside the string, it raises aValueErrorexception. Theindex()method is similar to thefind()method for strings. The only difference is thatfind()method returns-...
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]...
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. …
file 参数必须是一个具有write(string)方法的对象;如果参数不存在或为None,则将使用sys.stdout。 由于要打印的参数会被转换为文本字符串,因此print()不能用于二进制模式的文件对象。 对于这些对象,可以使用file.write(...)。 🐹 2. 数据的格式化输出 ...
#print(s4[10]) #IndexError: string index out of range #获取字符串的长度:len() #遍历字符串,和list,tuple的用法完全相同,通常与for循环搭配使用 for element in s4: print(element) for index in range(0,len(s4)): print(s4[index])
Return the number of non-overlapping occurrences of substring sub in string S[start:end]. Optional arguments start and end are interpreted as in slice notation."""return0#--- 大小写转化---#首字母大写defcapitalize(self):#real signature unknown; restored from __doc__"""S.capitalize() -> ...
combined_string = string1 + ' ' + string2 # 结果为 'Hello World' (2)重复(Repetition) 使用*运算符可以重复一个字符串指定的次数。 repeated_string = 'a' * 5 # 结果为 'aaaaa' (3) in的用法 使用in关键字可以检查一个字符串是否包含另一个子字符串。 substring = 'Python' substring in string...
需要再次提醒大家注意的是,在进行索引运算时,如果索引越界,会引发IndexError异常,错误提示信息为:string index out of range(字符串索引超出范围)。 字符的遍历 如果希望遍历字符串中的每个字符,可以使用for-in循环,有如下所示的两种方式。 方式一: s = 'hello' for i in range(len(s)): print(s[i]) 方式...