Python User-Defined Functions

Python User-defined Functions

 

We will learn what are user-defined functions in Python what are its advantages and calling a function.

What will you learn in this tutorial?

In this tutorial you will learn the following topics like-:

• What are the two types of functions in Python?

• What are User-defined functions?

• What are Built in Functions in Python?

• Calling a Function in Python?

• What is return in Python?

• Advantages of Functions?

• Programs on Functions?

What is user-defined function in Python?

Functions which are defined by the user to perform a specific task in a large system are called User-Defined Functions.

The functions which we use like print() are built in functions which are already present in python libraries.

All the functions that we write ourselves are user-defined functions which would be library for other person.

What are the advantages of user defined functions?

• User defined function to compress a large program into small segments which makes the program easy to understand.

• If you want to use one method again and again we can use user-defined functions which make program easy to write.

• If you want to make a large project you can divide the workload by making different functions.

How to write a user defined function in Python?

• User-defined function started with def and followed by function_name and arguments.

• Arguments are written inside parenthesis () followed by colon [ : ]

• After this we have to give four spaces to write the statements inside our functions (which are known as indentation in Python).

• After writing the statements we call the function.

They are used as-:

def function_name():
    statements
function_name()

Parameterized Functions-:

Parameterized Functions are those function which takes arguments.

They are used as-:

def function_name(arguments,arguments_2):
    statements
function_name(x,y)

Let us see a example on user defined function in detail -:

Write a Python Program to add two Number [ by User-Defined Functions ].

def add ( n , m ):
    print( n + m )
x=add(3,4)

Output -: 7

• Here we have defined the function add() which adds two numbers and prints the result.

• Here actual arguments pass their values to formal arguments.

• And then it will print the answer.

Questions for you-:

____ function_name():
    __________
function_name()

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