Creating custom modules in Python - Quick Revision & Summary

Recall & Review

beginner

What is a Python module?

A Python module is a file containing Python code, like functions and variables, that you can reuse in other Python programs by importing it.

beginner

How do you create a custom module in Python?

To create a custom module, write your Python code in a file with a <code>.py</code> extension. This file becomes your module which you can import in other scripts.

beginner

How do you import a custom module named <code>mymodule.py</code>?

Use the statement <code>import mymodule</code> in your Python script to use the functions and variables defined in <code>mymodule.py</code>.

intermediate

What is the purpose of the if __name__ == '__main__': block in a module?

It lets you run some code only when the module is run directly, not when it is imported. This is useful for testing your module.

intermediate

How can you organize multiple custom modules into a package?

Put your modules inside a folder with an <code>__init__.py</code> file. This folder becomes a package, letting you import modules using dot notation like <code>package.module</code>.

What file extension should a Python module have?

A .mod

B .txt

C .py

D .exe

Python modules are files with the .py extension.

How do you use functions from a custom module named tools.py?

A require tools

B include tools

C load tools

D import tools

You use import tools to access functions inside tools.py.

What does the if __name__ == '__main__': block do?

A Runs code only when the module is executed directly

B Imports all functions automatically

C Defines a class in the module

D Prevents the module from being imported

This block runs code only if the module is run as the main program.

How do you import a function greet from a module hello.py?

A import greet from hello

B from hello import greet

C include greet from hello

D load greet from hello

Use from hello import greet to import just the greet function.

What file is needed to make a folder a Python package?

A __init__.py

B main.py

C package.py

D setup.py

The __init__.py file tells Python the folder is a package.

Explain how to create and use a custom module in Python.

Think about writing code in one file and using it in another.

Describe the role of the if __name__ == '__main__': block in a module.

It controls when some code runs depending on how the module is used.