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Python programming language Functions

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Python programming language functions

In this tutorial, we will discuss the concept of Python programming language functions.

In python, function is a collection of related and reusable statements include as a single unit. This is used to perform a specific action that looks like a method.

Python programming language Functions

Basically two type of functions are available in python.

1. Built-in function – this functions defines and it is a built-in python programming language.
For Examples – Math function, String function
2. User- defined function – Users can define the function themselves.

This tutorial explains user defined functions

The advantages of using functions are:

clearly understanding code
reducing duplication in code
reuse of code
Information hiding

Syntax of python function

Syntax

About user-defined function

A function created with the def keyword in python that is used to identify the start of the function.
function_name is used to uniquely identify every function.
Parameters and arguments are used to pass variables and values to function but parameter passing is optional (it is not compulsory).
A colon mark is used to identify the end of the function.

Example of function

We can demonstrate about python function using the following examples

Program 1

How to create simple “hello world” program using python function

Example

When the above code is executed, it produced the following results.

Hello world

Program 2

Example

When the above code was executed, it produced the following results

hello i am a function

Program 3

When the above code was executed, it produced the following results

hello i am a function

Program 4

When the above code was executed, it produced the following results

hello mohan

hello kanthan
hello Nimal
hello Santhan

Program 5

When the above code was executed, it produced the following results

hay kamalan

Program 6

Python Functions

When the above code was executed, it produced the following results

Program 7

Function with argument

Python Functions

When the above code was executed, it produced the following results

Program 8

When the above code was executed, it produced the following results

(‘my first name is’, ‘logan’)

(‘my last name is’, ‘Mohan’)

(‘my age is’, 34)

(‘my sex is’, ‘M’)

The return ststement

We can use the return statement in Python

Syntex of return statement

return[expression_list]

Example 1

Example 2

When the above code was executed, it produced the following results

Example 3

When the above code was executed, it produced the following results

250

Default in python function

Program 1

Output

2 5

Program 2

Output

87 12.9 12 kannan

Program 3

Output

87 12.9 24 vannan

Find volume in a round shape

Output

33.5103216383

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