Constructor or main function in python

 main() function:

• By default, every program starts its execution from the main() function. In Python including a main() function is not mandatory.
• It can structure our Python in a logical way that puts components of the program the most in one program's important function.
• We can get the name of the current module executing by using the built-in variable name (2 underscores before and after of name).
• Most non-python programmers are having the habit of writing a main()function where the important and starter code of programs are written.
• In Python, we can also create main() and call it by checking name to main and then call any function, in this case main().

Example program:

1. def area(length,breadth):

       return length*breadth

   def main():

       l=int(input("Enter length: "))

       b=int(input("Enter length: "))

       a=area(l,b)

       print("Area of rectangle = ",a)

   if __name__=='__main__':

       main()

       print("__name__ name of value is : ",__name__)

Output:

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