So basically indentation is the problem ,(consider " ** " as spaces)
def area (l,b) :
**a=l*b
**print("Area is : " , a)
so anything you write after under this 'def ’ function with the same indentation as -->**a=l*b
**print("Area is : " , a) ,will be considered as a part of the def function .
so here when you are calling the function you are calling it in the function itself, so actually you are not giving any input to the function , So it will not give you any output.
so if we change indentations of :
area(4,6)
area(5,8)
area(2,100)
we can get the desired output.
The code can be written as :
def area (l,b) :
**a=l*b
**print("Area is : " , a)
area(4,6)
area(5,8)
area(2,100)