Command line args in Python :

    When the program comes to Python , it's all about libraries .Argparser is the library used for the taking inputs from the command line. Here you can validate the arguments which are entered by the user without writing the another function to validate from the if conditions.

suppose give a filename like cmdprocess.py
You can give the expecting arguments like below

cmdprocess.py --help

    it will give the total arguments with respective commands to represent

Required =True :

          When the required is true. You have to enter the argument.

 

Type = function name:

         Type is very useful to validate the input entered by the user. so that you can send a message like user need to enter the defined arguments only. This function always expects the input argument .

Custom-Exceptions In Python:

   There are multiple exceptions which are already present in python like AssertionError, TypeError ...etc. But when you want implement your own Exceptions like whenever you see , you  can say this one happened because of the particular problem is occurred .

YOU Can inherit the Exception class on this you can write your own exceptions like below

class InvalidResolutionException(Exception):
    def __init__(self, code, message):
        self.code = code
        self.message = message

Total program:

    If you don't know the which arguments needs to be parsed ,then do the --help command it will display the no of arguments and how to pass reference below.

Execute process

Passing the arguments and resultant show the user entered arguments for different command inputs

    When the programmer is added the required is true in the add_argument statement and , the user didn't choose to enter the argument then it will show the error like that required argument is missing

reference below.