Python Interview Prep: Coding and Testing a Character Doubling Function

Landing your first software role requires more than just knowing basic syntax; you need to know how to solve problems, write tests, and explain your logic. This text-based course guides you through a classic coding interview challenge: writing a function that doubles every character in a string. You will transition from writing basic scripts to crafting clean, robust, and fully tested Python functions. By reading through practical explanations and code breakdowns, you will understand how to analyze problem requirements, implement multiple algorithmic approaches, and verify your solutions. What you'll learn: - Understand the fundamentals of string manipulation and iteration in Python. - Implement a character doubling function using multiple approaches, including loops and list comprehensions. - Apply modern Python type hints to make your code clear and self-documenting. - Write basic unit tests using pytest to verify your code behaves correctly under various edge cases. - Analyze the complexity of your solutions to prepare for technical interview discussions. The course begins with foundational concepts of string handling and basic function design. You will then progress to writing the core logic, refactoring for efficiency, and implementing robust test cases. This course is designed for beginner Python developers preparing for technical interviews or looking to sharpen their problem-solving skills, with no advanced prerequisites required. Start reading today to build your confidence and tackle your next coding challenge with clean, tested Python code.