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....
我们可以先看一个简单的例子: s ="Duan Yixuan"x=len(s)print('The Length of %s is %d'%(s,x))#输出结果:The Length of Duan Yixuan is 11 分析: 'The length of %s is %d'这部分叫做:格式控制符 (s,x)这部分叫做:转换说明符 %字符,表示标记转换说明符的开始,类似于C语言中的用的逗号 接下来...
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...
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) | S.format_map(mapping) -> str | | Return a formatted version of S, using substitutions from mapping. | The substitutions are identified by braces ('{' and '}'). | | index(...) | S.index(sub[, start[, end]]) -> int | | Return the lowest index in S where substring ...
2. Substring or slicing 通过使用slice语法,我们可以获得一系列字符。索引从零开始。 str[m:n] 从位置2(包括)到5(不包括)返回字符串。 从索引2到5的子字符串 str='hello world'print(str[2:5])# llo 负切片将从末尾返回子字符串。 子串从索引-5到-2 ...
The answer is, to accomplish this kind of job, a developer needs to perform “string slicing.” In Python, string slicing is a type of technique that is used to get a specific part of a string, and this specific part later becomes a “substring.” ...
Get Your Code:Click here to download the free sample codethat you’ll use to check if a string contains a substring. Take the Quiz:Test your knowledge with our interactive “How to Check if a Python String Contains a Substring” quiz. You’ll receive a score upon completion to help you...
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, ...
find('of')) # -1 print(s.index('or')) # 8 print(s.index('or', 9)) # ValueError: substring not found 说明:find方法找不到指定的字符串会返回-1,index方法找不到指定的字符串会引发ValueError错误。 find和index方法还有逆向查找(从后向前查找)的版本,分别是rfind和rindex,代码如下所示。 s = ...