main.py 文件源码

def add_subparsers(parser):
    subparsers = parser.add_subparsers()
    # see http://stackoverflow.com/questions/18282403/
    # for the following two lines (py3 compat)
    subparsers.required = False
    subparsers.dest = "command"

    for func, args, kwargs in subcommand.discover(globals()):
        if len(args) > 1:
            name = args[1]
        else:
            name = func.__name__
        doc, description = parse_docstring(func.__doc__)
        subparser = subparsers.add_parser(name,
                                          description=description,
                                          help=doc)
        subparser.Action = argparse.Action
        add_generic_options(subparser)
        func(subparser)
        mainloc = args[0]
        subparser.set_defaults(mainloc=mainloc)