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The index() method in Python is used to find the first occurrence of a specified value within a string. If the value is not found, it raises a ValueError.
Example
txt = "Hello, welcome to my world."x = txt.index("welcome")print(x) # Output: 7コピーしました。✕コピーSyntax
string.index(value, start, end)コピーしました。✕コピーvalue: The value to search for.
start: Optional. Where to start the search. Default is 0.
end: Optional. Where to end the search. Default is the end of the string.
Usage with Start and End Arguments
You can specify the start and end positions for the search.
Example
txt = "Hello, welcome to my world."x = txt.index("e", 5, 10)print(x) # Output: 8コピーしました。✕コピーHandling Exceptions
If the value is not found, index() raises a ValueError.
Example
txt = "Hello, welcome to my world."try:print(txt.index("q"))except ValueError:print("Value not found") # Output: Value not foundコピーしました。✕コピーPractical Application
The index() method can be used to extract specific parts of a string based on certain conditions.
Example
Python String index () Method - W3Schools
Definition and Usage The index() method finds the first occurrence of the specified value. The index() method raises an exception if the value is not found. The index() method is almost the …
- value: Required. The value to search for
コード サンプル
txt = "Hello, welcome to my world."x = txt.index("welcome")print(x)...Python String index () Method - GeeksforGeeks
2025年5月2日 · This code demonstrates how to find the index of a substring within a specific range of a string using the index () method with optional start and end parameters.
5 Ways to Find the Index of a Substring in Python | Built In
- Below is a summary of what you need to remember about each Python string method. 1. str.find(), str,index(): These return the lowest index of the substring. 2. str.rfind(), str.rindex(): These return the highest index of the substring. 3. re.search(): This returns the match object that contains the starting and ending indices of the substring. 4. s...
How To Index and Slice Strings in Python - DigitalOcean
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Python String index () - Programiz
In this tutorial, we will learn about the Python index () method with the help of examples.
String Indexing in Python - PythonForBeginners.com
2022年1月9日 · String Indexing in Python will help you improve your python skills with easy to follow examples and tutorials. Click here to view code examples.
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Python string.index () Method (With Examples)
The index() method returns the index of the first occurence of a substring in the given string. It is same as the find () method except that if a substring is not found, then it raises an exception.
Python String index(): Locating the Index of a Substring in a String
In this tutorial, you'll learn how to use the Python string index () method to get the lowest index of a substring in a string.
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Discover the Python's index () in context of String Methods. Explore examples and learn how to call the index () in your code.
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2025年4月23日 · Understanding how string indexing works is crucial for tasks such as text manipulation, data extraction, and pattern matching. This blog post will explore the concepts, …
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