Python argparse 结合命令和命令参数

Question

我定义了两个命令（为简洁起见，我省略了解析器/子解析器部分，因为我认为不需要它们来回答问题）。

#COMMAND ARGS: Add Arguments to the final command "sacs am run [args]"
am_run_parser.add_argument("-s", action='store_const', const='s', dest='s', help="Output statistical reporting to the console.")
am_run_parser.add_argument("-S", action='store_const', const='S', dest='S', help="Output statistical reporting to the standard archive.")
am_run_parser.add_argument("-t", action='store_const', const='t', dest='t', help="Output timing reporting to the console.")
am_run_parser.add_argument("-T", action='store_const', const='T', dest='T', help="Output timing reporting to the standard archive.")
am_run_parser.add_argument("-R", action='store_const', const='R', dest='R', help="Output reject reporting to the standard archive.")
am_run_parser.add_argument("-b", "--bulk", type=int, nargs=1, help="MySQL Bulk Insert Quantity. Currently the default is set at " + str(defaults.bulk) + ". Theoretically, changing this value can affect how quickly inserts are performed.")
am_run_parser.add_argument("-host", nargs=1, help="The MySQL server host to output to.")
am_run_parser.add_argument("-port", nargs=1, help="The MySQL server port to output to.")
am_run_parser.add_argument("-user", nargs=1, help="The MySQL server username to use.")
am_run_parser.add_argument("-pw", nargs=1, help="The MySQL server password to use.")
am_run_parser.add_argument("-db", nargs=1, help="The MySQL server database to use.")
am_run_parser.set_defaults(func=am_cli_tools.am_run)

#COMMAND ARGS: Add Arguments to the final command "sacs am get [args]"
am_get_parser.add_argument("-a", action='store_const', const='a', dest='a', help="Get source A data for sacs am processing.")
am_get_parser.add_argument("-b", action='store_const', const='b', dest='b', help="Get source B data for sacs am processing.")
am_get_parser.add_argument("-c", action='store_const', const='c', dest='c', help="Get source C data for sacs am processing.")
am_get_parser.add_argument("-r", action='store_const', const='r', dest='r', help="Get source D data for sacs am processing.")
am_get_parser.add_argument("-t", action='store_const', const='t', dest='t', help="Get source E data for sacs am processing.")
am_get_parser.add_argument("-R", action='store_const', const='t', dest='t', help="Run the sacs am processor using the arguments specified after the run_args flag. This will perform the 'sacs am run' command after all specified sources are gathered (review the help file for this command for additional information about argument options).")
am_get_parser.set_defaults(func=am_cli_tools.am_get)

如您所见，我正在将 -R 参数添加到 sacs am get 命令。基本上，我希望能够在 get 完成后告诉 sacs am get 运行 sacs am run 命令，并且我想公开 sacs am run 的所有相关参数。例如sacs am get -abcrtR -run_args -sStTRb -host www.google.com -port 22 -user IBUser -pw IBpass -db IBpoken(lol)。

当然，这些 run_args 只适用于 -R 参数。

我怀疑有更好的方法来解决这个问题。所有选项都摆在桌面上。这些命令在运行时确实需要发送电子邮件（通常通过 cron 作业）；这是我希望选择组合命令的主要原因之一，因为如果我不这样做，我将不得不发送 2 封电子邮件而不是一封，因为这些命令必须单独运行。我想我可以做一些其他的事情，比如将它写入/附加到一个文件中，并创建另一个 sac am sendemail 命令让 cron 运行......但这种方法会使事情变得更加有序和简洁。

Answer 1

停止追求完美，让这该死的东西只发送两封电子邮件。