Welcome to another exciting Python lesson! Today, we're going to dive into the practical application of Python's strings while addressing real-world problems concerning text data! Imagine you're building a web scraper that gathers news articles from various sources. Alternatively, you might be developing a text-based algorithm to analyze user reviews for a website. In both cases, you'll likely work with strings and need to analyze and manipulate them. That's why today, we'll focus on how to loop over strings and perform operations on each character within a string using Python!

Our goal for this lesson is to learn about looping concepts in Python, with a specific focus on strings. We'll dive deep into string indexing techniques and gain experience performing character operations using Python’s built-in functions. Plus, we'll explore how to handle exceptions while performing these operations.

In Python, a string is a sequence. When scraping a website, you might receive all the text as a single string. Strings are sequences of characters, and Python allows us to loop over these sequences using a for loop. Here is an example:

This for loop will print each character of the string on a new line, proving beneficial when you need to locate specific characters or words on a web page.

Python strings operate under a zero-based indexing system. This setup means that we can access specific characters in the string merely by knowing their position. Let's see it in action: