reading-notes

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What are the key principles of Test-Driven Development (TDD) in Python, and how do they contribute to the overall quality of code?

1. Write Tests First: Before writing functional code, write tests that define the desired behavior.
2. Red, Green, Refactor:
   • Red: Write a test that fails because the feature isn’t implemented yet.
   • Green: Write minimal code to make the test pass.
   • Refactor: Clean up the code while ensuring tests still pass.
3. Small Iterations: Implement features in small increments, always keeping the code in a functional state.
4. Continuous Testing: Run tests frequently to catch issues early.
5. Refactoring: Regularly refactor code to improve structure and readability without changing its external behavior.

These principles ensure that the codebase remains reliable and easy to maintain, with a focus on fulfilling requirements and preventing regression.

Explain the purpose of the if __name__ == '__main__': statement in Python scripts. What are some use cases for including this conditional in your code?

Purpose of if __name__ == '__main__': in Python Scripts This statement checks if the script is being run as the main program and not being imported as a module in another script. It allows a script to provide functionality when run standalone and also serve as a reusable module.

• Use Cases:

  • Testing: To run tests when the script is executed directly. Executable Code: To execute specific code (like calling a main function) only when the script is run directly, not when imported.
  • Providing a CLI: When building a script that can be used as both a standalone CLI tool and a module.

Describe the concept of recursion in Python.

Recursion in Python is a technique where a function calls itself within its definition. It’s used to solve problems that can be broken down into smaller, identical problems. A recursive function must have a base case to terminate recursion and avoid infinite loops.

What is the difference between Python modules and packages? Explain how to create, import, and use them in your Python programs.

• Modules:

  A module is a single Python file containing Python definitions and statements, created by writing Python code in a .py file imported using import module_name or specific objects with from module_name import object.

• Packages:

  A package is a collection of Python modules in a directory, which must contain an __init__.py file.Created by placing multiple .py files (modules) in a directory with an __init__.py file. Imported similarly to modules, but you can also import specific modules from a package using from package import module.

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