User-defined Functions in Python

February 18, 2021

User-defined Functions

Functions that we define ourselves to do certain specific task are referred as user-defined functions.

Functions that readily comes with Python are called built-in functions. Python provides built-in functions like print(),input(), etc. but we can also create our own functions.

Advantages :

User-defined functions help to decompose a large program into small segments.
Function can be used to include repeated codes and execute when needed by calling that function.
Large project can be divided by making different functions.

Syntax :

def functionName ():
    statements…

#start function that will print value
def start():
    print(“Start”)

#add func that will return the added value
def add(x,y):
    return x+y

#function that prints the argument
def myPrint(p):
    print(p)

    
#driver code
#main
#calling start func
start()

a=15
b=20

#calling add() and the returned value will be stored in result variable
result=add(a,b)

#calling myPrint func
myPrint(result)

Output :

Start
35