strip():删除字符串前后的空格(或指定字符)。startswith(substring):检查字符串是否以指定的子字符串开始。endswith(substring):检查字符串是否以指定的子字符串结束。find(substring):返回子字符串在字符串中首次出现的索引,如果没有找到则返回-1。replace(old, new):替换字符串中的一个或多个指定值。split...
1. 字符串反向查找方法 在Python中,我们通常使用find()和rfind()方法进行字符串的正向和反向查找。 find(substring, start, end):在字符串中查找子字符串substring,并返回第一次出现的索引位置。参数start和end可选,表示查找的起始和结束位置。如果未找到子字符串,则返回-1。 rfind(substring, start, end):与fin...
# 'wc'不在字符串中 print( str.index('python') ) #ValueError: substring not found 1. 2. 3. 4. 5. 6. 7. 二、字符串替换 string1.replace(string2, [count]) 将str1中的str1替换成str2,,count可选,如果指定count,则不超过count次,如果不指定,表示全部替换,可以通过这个方法轻松去掉空格 ## ...
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 Working of Python string's find()...
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....
str.index(sub[, start[, end]]) --> int检测字符串string中是否包含子字符串 sub,如果存在,则返回sub在string中的索引值(下标),如果指定began(开始)和end(结束)范围,则检查是否包含在指定范围内,该方法与python find()方法一样,只不过如果str不在string中会报一个异常(ValueError: substring not found)。
S.find(substring, [start [,end]])#可指范围查找子串,返回索引值,否则返回-1 S.rfind(substring,[start [,end]])#反向查找 S.index(substring,[start [,end]])#同find,只是找不到产生ValueError异常 S.rindex(substring,[start [,end]])#同上反向查找 ...
i = input_str.find(substring, index) if i == -1: return l2 l2.append(i) index = i + 1 return l2 s = 'This Is The Best Theorem' print(find_all_indexes(s, 'Th')) Output:[0, 8, 17] You can checkout complete python script and more Python examples from ourGitHub Repository....
ValueError: substring not found 4.2 find函数 函数find的功能和函数index的功能类似,不同点在于如果子串不存在,函数find不会触发错误而是返回-1,举例如下: string = "abcdefg" print(string.find("a")) # 0 print(string.find("b")) # 1 print(string.find("c")) # 2 print(string.find("z")) #...
index()方法类似于字符串的find()方法。唯一的区别是,如果未找到子字符串,则find()方法返回-1,而index()则引发异常。下面,我们上代码解释:示例1:仅带有子字符串参数的index()sentence = 'Python programming is fun.'# Substring is searched in 'gramming is fun.'print(sentence.index('ing',...