寻找在蟒蛇，其中一些是PARAMS REQ一些选项给命令行参数的最佳方式，有些PARAMS是其他选项

你好我试图发送命令行参数的第一次。条件是一个参数是必需的一个选项，并为他人等参数。（寻找用户友好的）。下面的代码看起来需要一些优化：

import argparse
parser = argparse.ArgumentParser(description='Usage options.')
parser.add_argument('-o','--options',help='Options available: run,rerun,kill, resume,           suspend',required=True)
parser.add_argument('-c', '--config',help='config file input',type=file,required=False)
parser.add_argument('-j', '--id',help='id of the job',type=str,required=False)
args = parser.parse_args()
action_arg = list()
action_arg.append(args.options)
action = {'run': start_run,
          'rerun': start_rerun,
          'kill': kill_job,
          'resume': resume_job,
          'suspend': suspend_job,
          'get_run': get_run,
          'get_component': get_component,
          'help': print_help}.get('-'.join(action_arg))

if action:
    conf_file = str(args.config)
    jobid = str(args.jobid)
    if args.options == "run":
        if conf_file == "None":
            print "Job configuration is needed to start a run and job id is not needed"
            sys.exit(2)
    elif args.options == "rerun":
        if conf_file == "None" or jobid == "None":
            print "Job configuration and jobid is needed to start a rerun."
            sys.exit(2)
    else:
        if jobid == "None":
            print "Jobid is needed to perform %s action on job and configuration is not needed." %args.options
            sys.exit(2)
    action(conf_file, jobid)
else:
    print "Usage Error:"
    print_help()

希望你能收到我的要求PARAMS从代码所需的选项。请让我知道关于要求详细解释

在你的脚本这种变化运行，并清除几件事情。它使用choices控制选项的值。它省略了其他不必要的参数add_argument电话。它简化了后parse_args逻辑。 help是不是真的需要，因为总是有-h选项，但我把它作为一个选择。它属于贯穿始终，因为它不是在action字典。

import argparse
import sys
class Stub(object):
    def __init__(self,s):
        self.s = s
    def __call__(self,conf_file, jobid):
        print self.s, conf_file, jobid
parser = argparse.ArgumentParser(description='Usage options.')
parser.add_argument('-o','--options', choices=('run','rerun','kill', 'resume', 'suspend','help'),required=True)
parser.add_argument('-c', '--config',help='config file input')
# optionals normally not required; 'file' not valid type
# argparse.FileType will open the file
parser.add_argument('-j', '--jobid',help='id of the job')
# str is the default type
args = parser.parse_args()
# action_arg = [args.options]
action = {'run': Stub('start_run'),
          'rerun': Stub('start_rerun'),
          'kill': Stub('kill_job'),
          'resume': Stub('resume_job'),
          'suspend': Stub('suspend_job'),
          #'get_run': get_run, # not in choices
          #'get_component': get_component,
          #'help': print_help,
          }.get(args.options)  # what's with the '-'.join?

if action:
    if args.options == "run":
        if args.config is None: # proper test for None
            print "Job configuration is needed to start a run and job id is not needed"
            sys.exit(2)
    elif args.options == "rerun":
        if args.config is None or args.jobid is None:
            print "Job configuration and jobid is needed to start a rerun."
            sys.exit(2)
    else:
        if args.jobid is None:
            print "Jobid is needed to perform %s action on job and configuration is not needed." %args.options
            sys.exit(2)
    action(args.config, args.jobid)
else:
    print "Usage Error:"
    parser.print_help()

此版本替换options与subparsers选择。 config和jobid成为适当subparsers必需的参数。我用parents方便地定义所需的混搭。现在argparse做了所有检查。

import argparse
class Stub(object):
    def __init__(self,s):
        self.s = s
    def __call__(self,conf_file, jobid):
        print self.s, conf_file, jobid

conf_parent = argparse.ArgumentParser(add_help=False)
conf_parent.add_argument('-c', '--config',help='config file input',required=True)
job_parent = argparse.ArgumentParser(add_help=False)
job_parent.add_argument('-j', '--jobid',help='id of the job',required=True)

parser = argparse.ArgumentParser(description='Usage options.')
parser.set_defaults(config=None, jobid=None) # put default value in namespace
sp = parser.add_subparsers(dest='options')
sp.add_parser('run',parents=[conf_parent])
sp.add_parser('rerun',parents=[conf_parent, job_parent])
sp.add_parser('kill',parents=[job_parent])
sp.add_parser('resume',parents=[job_parent])
sp.add_parser('suspend',parents=[job_parent])
args = parser.parse_args()

action = {'run': Stub('start_run'),
          'rerun': Stub('start_rerun'),
          'kill': Stub('kill_job'),
          'resume': Stub('resume_job'),
          'suspend': Stub('suspend_job'),
          }.get(args.options)
action(args.config, args.jobid)