Скачать или смотреть Python Series|Part18|Function | Main types of function | Types based on Argument and Return Keyword

A function is a group of related statements that performs a specific task.
The idea is to put some repeatedly done task together and make a function, so that instead of writing the same code again and again for different inputs, we can call the function.
Python provides built-in functions like print(), etc., but we can also create our own functions. These functions are called user-defined functions.
Creating a Function:
Syntax:
def function_name(parameters):
statement(s)

Above shown is a function definition that consists of the following components:,

Keyword def that marks the start of the function header.
A function name to uniquely identify the function.

Parameters (arguments) through which we pass values to a function. They are optional.
A colon (:) to mark the end of the function header.
One or more valid python statements that make up the function body. Statements must have the same indentation level.
An optional return statement to return a value from the function.
Calling a Function:
To call a function, use the function name followed by parenthesis
Syntax:
function_name(parameters)
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 we want, just separate them with a comma.
Types based on arugument and return value:

FUNCTION WITH NO ARGUMENT AND NO RETURN VALUE
FUNCTION WITH ARGUMENT AND NO RETURN VALUE
FUNCTION WITH NO ARGUMENT AND WITH RETURN VALUE
FUNCTION WITH ARGUMENT AND WITH RETURN VALUE

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