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...
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...
= -1:print(f"The substring '{substring}' last appears at position {position}.")else:print(f"The substring '{substring}' was not found in the text.")```输出结果：```The substring 'Python' last appears at position 36.```四、find()函数的应用建议在实际应用中，find()函数是一种非常有...
(substring, 0, 10) print("Index within range 0 to 10:", index_range) # 输出: Index within range 0 to 10: 7 # 查找不存在的子串 nonexistent_substring = "Python" index_not_found = text.find(nonexistent_substring) print("Index of nonexistent substring:", index_not_found) # 输出: ...
print(quote.find('o small ',10,-1)) # Substring is searched in 'll things with'print(quote.find('things ',6,20)) Run Code Output -1 3 -1 9 Also Read: Python String index() Python String count()
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...
在Python中,字符串查找主要通过以下几种方法实现: str.find() str.index() str.count() in操作符 这几种方法在查找时都是区分大小写的。让我们通过一些代码示例来说明这一点。 示例代码 text="Welcome to Python Programming!"substring1="python"substring2="Python"# 使用 find() 方法index1=text.find(subs...
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...
/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...