A function is a block of code which only runs when it is called. You can pass data, known as parameters, into a function. A function can return data as a result. In Python a function is defined using the def keyword: To call a function, use the function name followed by parenthesis: Information can be passed into functions as arguments.

Mar 10, 2025 · In Python, functions are first-class objects meaning they can be assigned to variables, passed as arguments and returned from other functions. This enables higher-order functions, decorators and lambda expressions.

Oct 31, 2023 · Learn how to create and use a Python function with Python's def keyword, why functions are useful, and learn about variable scope.

In Python, you define a function using the def keyword, followed by the function name and parameters in parentheses: def function_name(parameters): """Docstring: explains what the function does""" # Function body # Code to execute return result # Optional return statement

Feb 10, 2025 · To define a function in Python, you use the def keyword followed by the function name and parentheses. Inside the parentheses, you can specify parameters that the function can accept. After the parentheses, add a colon and start a new indented block for the function body. Here’s the general syntax for defining a function:

Jul 28, 2021 · In any programming language, functions facilitate code reusability. In simple terms, when you want to do something repeatedly, you can define that something as a function and call that function whenever you need to. In this tutorial, we shall learn about user-defined functions in …

Apr 12, 2025 · Python Functions are fundamental building blocks in programming, enabling code reusability, organization, and modularity. This comprehensive guide will teach you everything about Python functions, from basic definitions to advanced concepts.

A lambda function is a small, anonymous function defined using the lambda keyword. It can have any number of arguments but only one expression, which is evaluated and returned. Lambda functions are often used for short, simple operations, especially in places where a full function definition is unnecessary, like with map(), filter(), or sorting.

In this tutorial, you’ll learn how to define user-defined Python functions. Here’s a simple function that shows a greeting: print('Hi') Code language: Python (python) This example shows the simplest structure of a function. A function has two main parts: a function definition and body.

Return Value: A function can optionally return a value using the return statement. Docstrings: It’s good practice to include a docstring (a string that explains the function’s purpose) after the function definition. Return Statement. Functions can return values using the return keyword. Example 6.2: Function with a Return Value