Python Function

  


Python Functions is a block of statements that does the specific task, and it can return or can not return the result depending on implementation. The idea is to put some commonly or repeatedly done tasks together and make a function so that instead of writing the same code again and again for different inputs, we can do the function calls to reuse the code contained in it repeatedly.

Advantages
It increases the code reusability.
List of countries
   
print("INDIA")
print("USA")
print("GERMANY")
print("UK\n")

print("INDIA")
print("USA")
print("GERMANY")
print("UK\n")

print("INDIA")
print("USA")
print("GERMANY")
print("UK\n")
 

Function without argument

def greetings():
    print("INDIA")
    print("USA")
    print("GERMANY")
    print("UK\n")
    
greetings()
greetings()


Find the area of a rectangle or square

length = 5 
width = 10
area_of_rectangle_1 = length*width
print("area: ", area_of_rectangle_1)
length = 15 
width = 10
area_of_rectangle_2 = length*width
print("area: ", area_of_rectangle_2)
length = 20
width = 10
area_of_rectangle_3 = length*width
print("area: ", area_of_rectangle_3)


Area of rectangle and square using a function with arguments

def area_of_rectanle_square(length, width):
    area = length*width
    print(f"area is {area}")

area_of_rectanle_square(5,10)
area_of_rectanle_square(15,10)
area_of_rectanle_square(20,10)
area_of_rectanle_square(30,30)


Area of rectangle and square using a function with arguments and return type

def area_of_rectanle_square(length, width):
    area = length*width
    return area

area = area_of_rectanle_square(5,10)
print(f"area is {area}")


Area of rectangle and square using a function with arguments and multiple returns

def area_and_perimeter(length, width):
    area = length*width
    perimeter = 2*(length + width)
    return area, perimeter

area, perimeter = area_and_perimeter(5,10)
print(f"area: {area} and perimeter: {perimeter}")