def function use in python

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Functions are a fundamental concept in Python programming that allows you to organize your code into reusable blocks. They help in improving code readability, maintainability, and can save you from duplicating code. In this tutorial, we will explore the basics of creating and using functions in Python, along with code examples.
In Python, you define a function using the def keyword, followed by the function name and a pair of parentheses. The function name should follow the same rules as variable names.
In this example, we've defined a simple function called greet that prints "Hello, World!" when called.
Functions can accept parameters, allowing you to pass values to them. Parameters are declared inside the parentheses during the function definition.
Here, greet_with_name takes one parameter (name) and prints a personalized greeting.
Functions can also return values using the return keyword. This allows you to use the result of a function in your code.
In this example, add_numbers takes two parameters (a and b) and returns their sum.
To use a function, you call it by its name followed by parentheses. If the function expects parameters, you provide them inside the parentheses.
These function calls will output:
You can provide default values for function parameters. This makes parameters optional, and if a value is not provided, the default is used.
In this case, if you don't provide an exponent, it defaults to 2.
Variables defined inside a function have local scope, meaning they are only accessible within that function. Variables defined outside functions have global scope and can be accessed from anywhere.
Functions are essential for structuring your code, making it more modular, and promoting code reuse. Understanding how to define, call, and use functions with parameters and return values is fundamental to Python programming. Start incorporating functions into your code to enhance its readability and maintainability.
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