use argparse to call function and use argument in function

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16 Mar 2017

1# Parse the subcommand argument first
2parser = ArgumentParser(add_help=False)
3parser.add_argument("function", 
4                    nargs="?",
5                    choices=['function1', 'function2', 'function2'],
6                    )
7parser.add_argument('--help', action='store_true')
8args, sub_args = parser.parse_known_args(['--help'])
9
10# Manually handle help
11if args.help:
12    # If no subcommand was specified, give general help
13    if args.function is None: 
14        print parser.format_help()
15        sys.exit(1)
16    # Otherwise pass the help option on to the subcommand
17    sub_args.append('--help')
18
19# Manually handle the default for "function"
20function = "function1" if args.function is None else args.function
21
22# Parse the remaining args as per the selected subcommand
23parser = ArgumentParser(prog="%s %s" % (os.path.basename(sys.argv[0]), function))
24if function == "function1":
25    parser.add_argument('-a','--a')
26    parser.add_argument('-b','--b')
27    parser.add_argument('-c','--c')
28    args = parser.parse_args(sub_args)
29    function1(args.a, args.b, args.c)
30elif function == "function2":
31    ...
32elif function == "function3":
33    ...
34

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