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  1. 123

    A function in Python is a block of reusable code designed to perform a specific task. Functions help in organizing code, making it more readable and reusable. They are defined using the def keyword followed by the function name and parentheses ().

    Creating and Calling a Function

    To create a function, use the def keyword followed by the function name and parentheses. Inside the parentheses, you can specify parameters. The function body contains the code to be executed and must be indented.

    def greet():
    print("Hello, World!")
    Copied!

    To call a function, use the function name followed by parentheses:

    greet() # Output: Hello, World!
    Copied!

    Function Arguments

    Functions can accept arguments, which are values passed to the function when it is called. These arguments are specified inside the parentheses in the function definition.

    def greet(name):
    print(f"Hello, {name}!")

    greet("Alice") # Output: Hello, Alice!
    Copied!

    Types of Arguments

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  2. W3School
    https://www.w3schools.com › python › python_functions.asp

    Python Functions - W3Schools

    Information can be passed into functions as arguments. Arguments are specified after the function name, inside the parentheses.You can add as many arguments as you wa…
    Parameters Or arguments?

    The terms parameter and argumentcan be used for the same thing: information that are passed into a function.

    Number of Arguments

    By default, a function must be called with the correct number of arguments. Meaning that if your function expects 2 arguments, you have to call the function with 2 arguments, not more, and not less.

    Arbitrary Arguments, *args

    If you do not know how many arguments that will be passed into your function,add a *before the parameter name in the function definition. This way the function will receive a tupleof arguments, and can access the items accordingly:

    Keyword Arguments

    You can also send arguments with the key = valuesyntax. This way the order of the arguments does not matter.

  3. GeeksForGeeks
    https://www.geeksforgeeks.org › python › python-functions

    Python Functions - GeeksforGeeks

    6 days ago · The idea is to put some commonly or repeatedly done task together and make a function so that instead of writing the same code again and again for …

  4. Programiz
    https://www.programiz.com › python-programming › function

    Python Functions (With Examples) - Programiz

      • Create a Function. Let's create our first function. def greet(): print('Hello World!') Here are the …
      • Calling a Function. In the above example, we have declared a function named greet(). def greet(): …
      • Example: Python Function Call. def greet(): print('Hello World!') # call the function greet() …
      • Python Function Arguments. Arguments are inputs given to the function. def greet(name): …
      • Example: Function to Add Two Numbers. # function with two arguments def add_numbers(num1, …
      See full list on programiz.com
  5. Python
    https://docs.python.org › library › functions.html

    Built-in Functions — Python 3.14.3 documentation

    Mar 25, 2026 · In this case, it is purely a convenience function so you don’t have to explicitly import pdb or type as much code to enter the debugger.

  6. Real Python
    https://realpython.com › cheatsheet

    Python Cheat Sheet

    Compact Python cheat sheet covering setup, syntax, data types, variables, strings, control flow, functions, classes, errors, and I/O.

  8. PYnative
    https://pynative.com › python-functions

    Python Functions [Complete Guide] – PYnative

    Jan 26, 2025 · Python function is a block of code defined with a name. Learn to create and use the function in detail. Use function argument effectively.

  9. Python Guides
    https://pythonguides.com › functions

    Python Functions - Python Guides

    Functions are one of the most powerful features in Python, enabling code reuse, abstraction, and modularity. By mastering the concepts covered in this guide, …

  10. Learn Python
    https://www.learnpython.org › en › Functions

    Functions - Learn Python - Free Interactive Python Tutorial

    Functions are a convenient way to divide your code into useful blocks, allowing us to order our code, make it more readable, reuse it and save some time. Also …

  11. TutorialsPoint
    https://www.tutorialspoint.com › python › python_functions

    Python - Functions - Online Tutorials Library

    A Python function is a block of organized, reusable code that is used to perform a single, related action. Functions provide better modularity for your application …

  12. Python Tutorial
    https://www.pythontutorial.net › python-basics › python-functions

    An Essential Guide to Python Functions By Examples

    In this tutorial, you'll learn to define custom Python functions so that you can reuse them in the program.

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