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Functions & basics

Reusable building blocks — parameters, returns, scope, and clear function design.

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How to Create Functions with Default Parameters in Python

This code defines two Python functions using default parameters to handle missing arguments gracefully, demonstrating how to work with optional inputs and keyword arguments.

default-parameters functions arguments

Python

def greet(name="Guest", greeting="Hello", punctuation="!"):
    """Generate a greeting message using default parameters."""
    return f"{greeting}, {name}{punctuation}"


def create_profile(username="anonymous", age=0, city="Unknown", active=True):
    """Create a user profile dictionary with default values."""
    r…

14 0 Open

Functions & basics easy

How to Use *args and **kwargs in Python Functions

Implement a variadic function that accepts arbitrary positional and keyword arguments using *args and **kwargs.

args kwargs variadic

Python

def display_info(title, *args, **kwargs):
    """Display positional and keyword arguments received."""
    print(f"Title: {title}")
    print(f"Additional positional args ({len(args)}):")
    for i, arg in enumerate(args, 1):
        print(f"  {i}. {arg}")
    print(f"Keyword args ({len(kwargs)}):")
    for key, value…

14 0 Open

Functions & basics easy

Python Function Default Parameters Explained with Examples

Learn how to define Python functions with default parameter values and call them with fewer arguments than declared.

functions default-parameters args

Python

def greet(name, greeting="Hello", punctuation="!"):
    return f"{greeting}, {name}{punctuation}"

def calculate_area(length, width=1, unit="sq units"):
    area = length * width
    return f"Area: {area} {unit}"

if __name__ == "__main__":
    print(greet("Alice"))
    print(greet("Bob", "Hi"))
    print(greet("Charl…

14 0 Open

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