How to create a function in python

This tutorial is how to create a function in python. Python function is a block of code that performs some specific task. and Its function name has unique.

The python function’s main aim of the program more readable, and organized. and Reduce repeated code.

Define a function

Create in python function use def keyword. Define function name is unique for the function and in parenthesis, you can specify your parameters.

Function block starts with colon(:).

Syntax

def function_name(paramenter):
     # statement

Example

def fun_call():
     print("Python function is called!")

fun_call() function which not take any arguments. when fun_call function called It print text on the screen.

Call a function

Python function call to specify the function name and specify the parameters in parentensis().

Syntax

def function_name(parameter): # define function
     # statement

function_name(parameter) # call function

Example

def fun_call():
     print("Function called successfully!")
fun_call()
fun_call()

Output:

Function called successfully!
Function called successfully!

Function with parameter

Python function call to specify the parameter in the function different-different parameters.

Syntax

def function_name(parameter):
     # statement
function_name(parameter)

Example

def checkoddeven(number):
    if number%2 == 0:
        print("Even number")
    else:
        print("Odd number")
checkoddeven(30)
checkoddeven(7)
checkoddeven(55)

Output:

Even number
Odd number
Odd number

Function with return

Python function Use return statement to return value from the function.

Syntax

def function_name(paramenter):
    # statement
    return value

Example

def checkMaxValue(list_data):
    max_val = list_data[0]
    for val in list_data:
        if val > max_val:
            max_val = val
    return max_val
list_data = [1,32,33,55,98,99,56,46,22]
print("Maximum value is :",checkMaxValue(list_data))

Output:
Maximum value is : 99

Default value

The python function call to the Default parameter automatically gets even if don’t pass arguments while calling the function.

Syntax

def function_name(variable1=value,variable2=value,n):
    # statement

Example

def studentInfo(firstname,lastname="Joi",age=33):
    print("first name : ",firstname,", last name : ",lastname,", age : ",age)

studentInfo("Die")
studentInfo("Hitesh",age=22) # Change age
studentInfo("Emaly","Kill") # Change lastname

Output:
first name :  Die , last name :  Joi , age :  33
first name :  Hitesh , last name :  Joi , age :  22
first name :  Emaly , last name :  Kill , age :  33

Multiple parameters

The python function call to handling an unknown amount of items to function we use an asterisk (*)
sign-in function.

Syntax

def function_name(*argument):
    # statement

Example

def display_fun(name,*friends):
    print("Name :",name)
    print("Friends :",lastname)

display_fun("Emily kill","joi","die","john")

Output:

Name : Emily kill
Friends : ('joi', 'die', 'john')

*friends variable is converts the friends argument into a tuple.