store：默认action模式，存储值到指定变量。    store_const：存储值在参数的const部分指定，多用于实现非布尔的命令行flag。    store_true / store_false：布尔开关。 store_true.默认为False，输入则为true。 store_flase 相反    append：存储值到列表，该参数可以重复使用。    append_const：存储值到列表，存储值在参数的const部分指定。    count: 统计参数简写输入的个数  add_argument("-c", "--gc", action="count")    version 输出版本信息然后退出。    const:配合action="store_const|append_const"使用，默认值    choices:输入值的范围 add_argument("--gb", choices=['A', 'B', 'C', 0])    required : 默认False, 若为 True, 表示必须输入该参数==================================================================================    KeyWord Arguments:        - option_strings -- A list of command-line option strings which    should be associated with this action.        - dest -- The name of the attribute to hold the created object(s)        - nargs -- The number of command-line arguments that should be  consumed. By default, one argument will be consumed and a single  value will be produced.                      Other values include:

                - N (an integer) consumes N arguments (and produces a list)                - '?' consumes zero or one arguments                - '*' consumes zero or more arguments (and produces a list)                - '+' consumes one or more arguments (and produces a list)                    Note that the difference between the default and nargs=1 is that with the default, a single value will be produced, while with  nargs=1, a list containing a single value will be produced.        - const -- The value to be produced if the option is specified and the  option uses an action that takes no values.        - default -- The value to be produced if the option is not specified.        - type -- A callable that accepts a single string argument, and returns the converted value.                      The standard Python types str, int,  float, and complex are useful examples of such callables.  If None,  str is used.        - choices -- A container of values that should be allowed.                     If not None,  after a command-line argument has been converted to the appropriate type, an exception will be raised if it is not a member of this collection.        - required -- True if the action must always be specified at the command line. This is only meaningful for optional command-line  arguments.        - help -- The help string describing the argument.        - metavar -- The name to be used for the option's argument with the  help string. If None, the 'dest' value will be used as the name.

创建子parse,每个子parse对应自己的输入参数

import argparse# sub-command functionsdef subcmd_list(args):   print "list"def subcmd_create(args):   print "create"def subcmd_delete(args):   print "delete"parser = argparse.ArgumentParser()subparsers = parser.add_subparsers(help='commands')# A list commandlist_parser = subparsers.add_parser('list', help='Listcontents')list_parser.add_argument('dirname', action='store',	help='Directory tolist')list_parse.set_defaults(func=subcmd_list)# A create commandcreate_parser = subparsers.add_parser('create', help='Create a directory')create_parser.add_argument('dirname',action='store',help='New directoryto create')create_parser.add_argument('--read-only',default=False, action='store_true',help='Setpermissions to prevent writing to the directory')create_parser .set_defaults(func=subcmd_create)# A delete commanddelete_parser = subparsers.add_parser('delete',help='Remove a directory')delete_parser.add_argument(	'dirname', action='store',help='The directory to remove')delete_parser.add_argument('--recursive', '-r',default=False, action='store_true',help='Remove thecontents of the directory, too')delete_parser .set_defaults(func=subcmd_delete)args = parser.parse_args()# call subcmdargs.fun(args)使用帮助
# python args_subparse.py -husage: args_subparse.py [-h] {create,list,delete} ...positional arguments:  {create,list,delete}  commands    list                Listcontents    create              Create a directory    delete              Remove a directoryoptional arguments:  -h, --help            show this help message and exit  # python args_subparse.py create -husage: args_subparse.py create [-h] [--read-only] dirnamepositional arguments:  dirname      New directoryto createoptional arguments:  -h, --help   show this help message and exit  --read-only  Setpermissions to prevent writing to the directory  # python args_subparse.py delete -husage: args_subparse.py delete [-h] [--recursive] dirnamepositional arguments:  dirname          The directory to removeoptional arguments:  -h, --help       show this help message and exit  --recursive, -r  Remove thecontents of the directory, too # python args_subparse.py list -husage: args_subparse.py list [-h] dirnamepositional arguments:  dirname     Directory tolistoptional arguments:  -h, --help  show this help message and exit多个subparser 使用同样定义的参数# add_help=False,必须指定，否则报-h重复定义parents_parser = argparse.ArgumentParser(add_help=False)parents_parser.add_argument('--foo', dest="foo", action='store_true')parents_parser.add_argument('--bar', dest="bar", action='store_false')parents_parser.add_argument('--baz', dest="baz", action='store_false')parser = argparse.ArgumentParser()subparsers = parser.add_subparsers(help='commands')m_parser = subparsers.add_parser("MySQL", parents=[parents_parser], help="mysql method")m_parser.set_defaults(func=sub_mysql)o_parser = subparsers.add_parser("Oracle", parents=[parents_parser], help="oracle method")o_parser.set_defaults(func=sub_oracle)args = parser.parse_args()参考http://blog.csdn.net/songuooo/article/details/8373086http://www.2cto.com/kf/201208/149418.htmlhttp://stackoverflow.com/questions/7498595/python-argparse-add-argument-to-multiple-subparsers