Testing and Modules
why this topic matters
Reading Questions
### 1. What are the key principles of Test-Driven Development (TDD) in Python, and how do they contribute to the overall quality of code?
Test Driven Development is the process in which test cases are written before the code that validates those cases. It depends on repetition of a very short development cycle.
Test driven Development is a technique in which automated Unit test are used to drive the design and free decoupling of dependencies
Benefits:
- Unit test provides constant feedback about the functions.
- Quality of design increases which further helps in proper maintenance.
- Test driven development act as a safety net against the bugs.
- TDD ensures that your application actually meets requirements defined for it.
- TDD have very short development lifecycle.
2. Explain the purpose of the if __name__ == ‘__main__’: statement in Python scripts. What are some use cases for including this conditional in your code?
used in Python scripts to control the execution of the script. It checks the value of the name attribute, which is a built-in variable that is set by the Python interpreter when a script is executed.
###execute the code only if it is called as a script and not execute when it is imported as a module.
- used to import and test modules in Python. This can be useful for testing and debugging purposes. Because it allows you to run a module’s test functions without having to import the module into another script.
- statement should be used in a Python script when you want to control the execution of the script based on whether it is being run directly or being imported as a module by another script.
- statement can be used to define the entry point of a Python script that is intended to be run from the command line.
3. Describe the concept of recursion in Python.
The term Recursion can be defined as the process of defining something in terms of itself. In simple words, it is a process in which a function calls itself directly or indirectly.
4. What is the difference between Python modules and packages? Explain how to create, import, and use them in your Python programs.
Modules in Python
A module is a file with the extension.py that contains Python or C executable code. A module is made up of a number of Python statements and expressions.
Packages in Python
To provide an application development environment, a python package establishes a hierarchical directory structure with several modules and sub-packages. They are nothing more than a bundle of modules and sub-packages.
differencies
- A Package is a directory containing numerous modules and sub-packages, whereas a Module is a.py file containing Python code.
- An init .py file is required to create a package. There is no such necessity when it comes to creating modules.
- We can import all objects in a module at once by using the asterisk (*) operator but we can’t import all modules in a package at once.
### how to create ,import ,and use modules?