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In Python, the index of a string refers to the position of a particular character within the string. The indexing starts from 0, meaning the first character has an index of 0, the second character has an index of 1, and so on. Additionally, negative indexing is allowed, where -1 represents the last character, -2 the second-to-last, and so forth.
Let's dive into the basics of string indexing in Python with some code examples.
In this example, we define a string and access its first and second characters using positive indexing.
Negative indexing allows us to access characters from the end of the string. In this example, we retrieve the last and second-to-last characters using negative indices.
Apart from indexing individual characters, we can also use slicing to extract substrings from a given string. Slicing is done using the format string[start:stop:step], where start is the starting index, stop is the stopping index (exclusive), and step is the step size.
In this example, we use slicing to extract a substring from the original string.
To find the index of a specific substring within a larger string, we can use the find() method or the index() method.
Both find() and index() return the index of the first occurrence of the specified substring. The difference is that find() returns -1 if the substring is not found, while index() raises a ValueError. Choose the method that best suits your needs.
Now you have a basic understanding of string indexing in Python. Experiment with these concepts to enhance your proficiency in working with strings in Python.
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