如果find()函数在字符串中找不到匹配的子字符串,它将返回-1。要解决这个问题,你可以在使用find()函数之前先使用in关键字进行检查,以确保子字符串存在于字符串中。以下是一个示例: string = "Hello, World!" substring = "lo" if substring in string: index = string.find(substring) print(f"Substring fo...
在 Python 中，字符串对象的 find() 方法是一种强大的工具，用于查找子字符串在原字符串中的位置。下面详细介绍了 find() 方法的基本用法和一些示例。基本用法：result = str.find(substring, start, end)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...
#include <Python.h> #include <string.h> off_t _find_nth(const char *buf, size_t l, char c, int n) { off_t i; for (i = 0; i < l; ++i) { if (buf[i] == c && n-- == 0) { return i; } } return -1; } off_t _find_nth2(const char *buf, size_t l, char...
在一个str中查找特定的字符串，使用string1.find(substring)的语法，这种查找时一种模糊查找；但是在一...
Python has string.find() and string.rfind() to get the index of a substring in a string. I'm wondering whether there is something like string.find_all() which can return all found indexes (not only the first from the beginning or the first from the end). For example: string = "tes...
# 需要导入模块: from solution import Solution [as 别名]# 或者: from solution.Solution importfindSubstring[as 别名]#!/usr/bin/env python# -*- coding: utf-8 -*-fromsolutionimportSolution inpt1 ="barfoothefoobarman"inpt2 = ["foo","bar"] ...
what Is a Substring? A substring can be defined as any sequence of characters that are contained within a string. In simple terms, it can be said to be a slice or a small part of the original string. How To Find All Substrings of String in Python?
str.find(str, beg=0, end=len(string))「参数：」str -- 指定检索的字符串beg -- 开始索引，默认为0。end -- 结束索引，默认为字符串的长度。「返回值：」如果包含子字符串返回开始的索引值，否则返回-1。「示例：」str1 = 'I Love Python'print(str1.find('Love'))print(str1.find('I', 1,...
print(str1.find('Python',2)) 输出: 2 -1 7 index()方法 index() 方法检测字符串中是否包含子字符串,如果指定 beg(开始) 和 end(结束) 范围,则检查是否包含在指定范围内,如果不在,返回一个异常。 「语法:」 str.index(substring, beg=0, end=len(string)) ...
The find() is a built-in method in Python that searches for a substring in a string. It returns the index of the first occurrence of the substring or -1 if not found. It holds: The substring argument is required and used to search it in the given string. The start and end arguments...