How to use user defined functions in python

Published: 16 November 2023
on channel: CodeGPT

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User-defined functions are an essential feature in Python that allow you to encapsulate a block of code into a reusable module, making your code more organized, readable, and efficient. In this tutorial, we'll explore how to create and use user-defined functions in Python, along with code examples to illustrate the concepts.
In Python, you can define a user-defined function using the def keyword, followed by the function name and a pair of parentheses. The function body is indented, and it should contain the code you want to execute when the function is called.
Functions can take input values called arguments, which are specified within the parentheses when defining the function. You can use these arguments within the function to perform specific operations.
Functions can also return values using the return statement. The value returned by the function can be stored in a variable or used directly.
To execute a user-defined function, you simply call it by its name followed by parentheses. If the function takes arguments, you provide them within the parentheses.
Variables defined inside a function have local scope, which means they are only accessible within that function. Variables defined outside of any function have global scope and can be accessed from anywhere in the code.
Here's a simple function that takes no arguments and prints a greeting message:
A function that takes two numbers as arguments, adds them, and returns the result:
You can provide default values for function arguments, allowing you to call the function with fewer arguments if needed.
A recursive function that calculates the factorial of a number:
These examples demonstrate the fundamental concepts of user-defined functions in Python. Functions are a powerful way to structure your code and make it more modular and easier to maintain.
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