import argparse
parser = argparse.ArgumentParser()
parser.add_argument('-c', dest='variable', default=False,
                    action='store_const', const=True,
                    help='A flag which was in a bool state');
parser.add_argument("-u", dest='url', type=str,
                    help='Use this argument for indicate an url')
args = parser.parse_args()
print(args.variable)
if type(args.url) is None:
    print('You can input an url address. Use -u <example.com>')
else:
    print(args.url)