how to use argparse

1import argparse
2
3# construct the argument parse and parse the arguments
4ap = argparse.ArgumentParser()
5ap.add_argument("-n", "--name", required=True, help="name of the user")
6args = vars(ap.parse_args())
7
8# display a friendly message to the user
9print("Hi there {}, it's nice to meet you!".format(args["name"]))

1import argparse
2
3if __name__ == "__main__":
4	#add a description
5	parser = argparse.ArgumentParser(description="what the program does")
6
7	#add the arguments
8	parser.add_argument("arg1", help="advice on arg")
9	parser.add_argument("arg2", help="advice on arg")
10#						.
11# 						.
12#   					.
13	parser.add_argument("argn", help="advice on arg")
14
15	#this allows you to access the arguments via the object args
16	args = parser.parse_args()
17
18	#how to use the arguments
19	args.arg1, args.arg2 ... args.argn

1import argparse
2
3parser = argparse.ArgumentParser()
4parser.add_argument('file', type=argparse.FileType('r'))
5args = parser.parse_args()
6
7print(args.file.readlines())

1# Generic parser function intialization in PYTHON
2def create_parser(arguments):
3    """Returns an instance of argparse.ArgumentParser"""
4    # your code here
5    
6    parser = argparse.ArgumentParser(
7        description="Description of your code")
8    parser.add_argument("argument", help="mandatory or positional argument")
9    parser.add_argument("-o", "--optional", 
10    	help="Will take an optional argument after the flag")
11    namespace = parser.parse_args(arguments)
12    
13    # Returns a namespace object with your arguments
14    return namespace
15

1...
2parser.add_argument('--val',
3                    choices=['a', 'b', 'c'],
4                    help='Special testing value')
5
6args = parser.parse_args(sys.argv[1:])

1parser.add_argument("-v", "--verbose", action="store_true",
2                    help="verbose output")