Functions in Python 3

By
PythonBaba
-
2930

In this article, we will learn how to define functions, using the function with variables and function returning value.

In Python, we define a function with a keyword starting with def than the name of the function. A function can have zero or any number of arguments. We will further use the line of codes under the function. To call a function we can call with function name with or without variables.

Syntax: 
def funtion_name(var1, Var2, Var3.....varN):
    Code line 1...
    Code line 2...

Programming function with Zero Argument

Code: 
def greater_function():
    print("a is greater than b")


def smaller_function():
    print("a is smaller than b")


a = 3
b = 7
if a > b:
    greater_function()
else:
    smaller_function()

 

Output: 
a is smaller than b

 

Programming function that accepts arguments

We will make a program with basic calculator functionalities that provide addition, multiplication, subtraction and division functions.

Code: 
def addition_fun(a, b):
    return a + b


def multiply_fun(a, b):
    return a * b


def subtraction_fun(a, b):
    return a - b


def division_fun(a, b):
    return a / b


x = int(input("Enter any integer value: "))
y = int(input("Enter any integer value: "))
print("Result after Addition is {}".format(addition_fun(x, y)))
print("Result after Multiplication is {}".format(multiply_fun(x, y)))
print("Result after Subtraction is {}".format(subtraction_fun(x, y)))
print("Result after Division is {}".format(division_fun(x, y)))

 

Output: 
Enter any integer value: 10
Enter any integer value: 5
Result after Addition is 15
Result after Multiplication is 50
Result after Subtraction is 5
Result after Division is 2.0