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()...
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....
「示例：」str1 = 'I Love Python'print(str1.index('Love'))print(str1.index('I', 1, 8))输出：2Traceback (most recent call last): File "C:\1.py", line 3, in <module> print(str1.index('I', 1, 8))ValueError: substring not found如果字符串中找不到子字符串，index() 则...
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...
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) ...
/Users/llq/PycharmProjects/pythonlearn/pythonlearn/.venv/bin/python/Users/llq/PycharmProjects/pythonlearn/pythonlearn1/find.pyTraceback(most recent call last):File"/Users/llq/PycharmProjects/pythonlearn/pythonlearn1/find.py",line12,in<module>result=info.index('ok')ValueError:substring not found...
Python字符串find()方法有助于查找给定字符串中子字符串首次出现的索引。 如果子字符串不存在,它将返回-1。 语法 string.find(substring,start,end) 参数 substring:要在给定字符串中搜索的子字符串。 start :(可选)从开始搜索子字符串的起始值。 默认情况下为0。