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Reference library

Functions & basics

Small reusable building blocks — parameters, returns, and clear function design.

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Functions & basics easy

Function with default argument

Define a reusable greet helper with an optional prefix parameter.

functions defaults basics
Python 
def greet(name, prefix="Hello"):
    return f"{prefix}, {name}!"


print(greet("Python"))
print(greet("World", prefix="Hi"))
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Functions & basics — Python code examples

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This page collects functions & basics snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

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Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

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