Optimize beginner python script about substring replacement

Title: Optimizing Python Script for Substring Replacement: A Beginner's Guide
Introduction:
In this tutorial, we'll explore how to optimize a beginner's Python script that performs substring replacement. We'll walk through the process of identifying inefficiencies and implementing improvements, ensuring that the script runs more efficiently and follows best practices. Throughout the tutorial, we'll use code examples to illustrate each step.
Script Overview:
Let's start with a basic Python script that replaces a specified substring in a given text. Here's an example:
This script defines a function replace_substring that takes an original text, an old substring, and a new substring as input and returns the modified text with the replacement. The example usage demonstrates replacing the substring "simple" with "optimized."
Optimization Steps:
Error Handling:
Improve error handling by checking if the provided arguments are of the correct types. Add appropriate type checks and raise exceptions if needed.
Case Sensitivity:
Make the substring replacement case-insensitive by using the re module. This allows the script to handle cases where the substring has different letter cases.
Efficiency:
Improve efficiency by avoiding unnecessary checks. Instead of checking if the substring is present in the text before replacing it, directly perform the replacement.
Conclusion:
By following these optimization steps, we've enhanced our substring replacement script in terms of error handling, case sensitivity, and efficiency. Feel free to apply these principles to other scripts and continually strive to improve your Python coding skills.
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