beginner
6 min read
Defining Functions in Python
A function turns a block of code into a named tool you can call by name. Write the steps once, give them a name, and reuse them across your program instead…
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Functions and Modules
Learn how to organize reusable Python code with functions, arguments, scope, built-in functions, modules, imports, and practical code-reuse patterns.
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Articles in Functions and Modules
Follow these lessons in order, or jump directly to the topic you need.
beginner
7 min read
Function Arguments and Return Values
Arguments are how you feed a function; return values are how it hands you the answer. Master both and you stop writing one-off code and start wiring…
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beginner
7 min read
Importing Modules in Python
An import statement is not a magic incantation. It is a name-resolution request: you tell the running Python program, "find this module and make its names…
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beginner
7 min read
Writing Your First Python Module
A Python module is just a .py file you can reuse from other files. The moment you split one growing script into two files and import one from the other,…
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beginner
14 min read
Practice Exercises: Functions
Reading about functions teaches you the rules. Writing them teaches you the mechanism. These python functions exercises are built so you run code, inspect…
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beginner
7 min read
Lambda Functions for Beginners: Anonymous Functions in Python
You've learned to write functions with def, giving each one a name and a job. Then you meet lambdas and wonder: should I be rewriting everything? The short…
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beginner
9 min read
Scope and Lifetime of Variables in Python
You write a function. It works perfectly. The variable inside it prints exactly what you expected. Then you try to use that same variable outside the…
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beginner
8 min read
Using Built-in Python Functions: A Beginner's Guide
Python ships with a toolbox of ready-made functions. You call them, they do the job, and you move on. No imports. No setup. Just a name, some parentheses,…
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beginner
7 min read
Writing Reusable Python Code: DRY Principles for Beginners
Copy-paste feels fast. It is also how small scripts turn into maintenance traps.
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beginner
7 min read
Practice Exercises: Modules and Imports
Reading about imports is easy. Running them until they work from memory is where the skill actually forms. You can follow a tutorial on Python modules and…
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intermediate
10 min read
How to Organize a Small Python Project
Every Python project starts as a single script that does one job. Then it grows. You add a feature, then another, then a helper function that needs its own…
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