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...
strings_and_positions=[("Python programming",0,6),("Data Science",5,12),("Machine Learning",0,7)]foriteminstrings_and_positions:string,start,end=itemprint(f"Input String:{string}-> Substring:{get_substring_between_positions(string,start,end)}") 1. 2. 3. 4. 5. 6. 7. 8. 9. 结...
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" 的位置 index_in_range = my_string.find("Python", 0, 25) print(f"The substring 'Python' within range [0, 25) is found at index: {index_in_range}") # 查找不存在的子字符串 "Java" 的位置 index_not_found = my_string.find("Java") print(f"The substring 'Java' is not ...
substring = "world" # 在整个字符串中查找子串 index_full = text.find(substring) print("Index in full string:", index_full) # 输出: Index in full string: 7 # 从特定位置开始查找子串 index_from_5 = text.find(substring, 5) print("Index starting from index 5:", index_from_5) # 输出...
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....
unt三个函数,分a = 'hello accountant'# Use the upper function to convert the string to uppercasea_upper = a.upper()print(a_upper) # Output: 'HELLO ACCOUNTANT'# Use the find function to find the index of a substring in the stringindex = a.find('accoun')print(index) ...
以下是一个Python中的"find"函数示例: ```python string = "Hello, world!" substring = "world" position = string.find(substring) print("The position of 'world' in the string is:", position) ``` 输出: ```python The position of 'world' in the string is: 7 ``` 在这个例子中,我们...
python string find没找到返回什么 本文实例讲述了Python数据类型之String字符串。分享给大家供大家参考,具体如下: String(字符串) 1、概述 字符串是以单引号或双引号括起来的任意文本,比如"abc",‘xy'等等,请注意‘'或者""本身只是一种表示方式,并不是字符串的一部分。
今天给大家说下python字符串的find方法,从python的文档里可以知道find方法是查找子串在字符串的开始位置。 看下文档解释: string.find(s, sub[, start[, end]]) Return the lowest index in s where the substring sub is found such that sub is wholly contained in s[start:end]. Return -1 on failure...