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Python Functions

Python Functions

Python is an object-oriented programming language that also allows for functional programming.

You will learn about Python functions and how to build and invoke them in this course.

In addition, you will learn about the parameters of Python functions, the return statement, anonymous Python functions, and what recursion is in Python.

What are Python Functions?

A function is a code block with a name that you can call. You can construct a function and then call it 100 times instead of writing anything 100 times. It can be called from anywhere in your programme at any time. This makes your code more reusable and modular.

Arguments can be sent to functions, and they can return values.

Python Functions Types
Built-in and user-defined functions are the two types of functions available.

Although Python has many helpful built-in functions such as print() and type(), we will concentrate on user-defined functions Creating Python Functions
The def keyword is used to define a function. You name the function and, if desired, pass it some parameters. Then you specify a code block that will be executed when the function is called.

Because Python lacks curly brackets, you must indent this code block if you want it to work. The function can be made to return a value.
Parameters for Python Functions

1. Arguments by default

For parameters, you can set a default value. The user does not need to provide a value for that argument if they call the function. It is assumed that the default value will be utilised. 

2. Arguments with Keywords

You don't have to remember the order of the parameters if you give keyword arguments to a function.

3. Irrational Arguments

You can use the arbitrary arguments *args and **kwargs if you don't know how many arguments your function will get at runtime.

The Python Return Statement

A function does not have to return a value, but it can. The return keyword is used for this.

A variable number of arguments is represented by *args, while a variable number of keyword arguments is represented by **kwargs. You can call them whatever you like.

The Python Return Statement

A function does not have to return a value, but it can. The return keyword is used for this.

If you're looking for a way to make anonymous functions in Python, look no further.

You can avoid giving a function a name if you only intend to use it once or if it only includes one line of code. Lambda expressions are what they're called.

Python's recursion

Recursion occurs when a function calls itself. In other words, recursion occurs when the body of a function contains calls to the function itself.

You must give a base condition for recursion; otherwise, the function will run indefinitely.

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