基于argparse的调用函数 [英] Call function based on argparse

问题描述

我是python的新手，目前正在使用它. 我有一个脚本，对设备执行一些API调用.我想扩展功能并根据调用脚本时给出的参数调用不同的功能.

I'm new to python and currently playing with it. I have a script which does some API Calls to an appliance. I would like to extend the functionality and call different functions based on the arguments given when calling the script.

当前，我有以下内容:

parser = argparse.ArgumentParser()
parser.add_argument("--showtop20", help="list top 20 by app",
                    action="store_true")
parser.add_argument("--listapps", help="list all available apps",
                    action="store_true")
args = parser.parse_args()

我也有一个

def showtop20():
    .....

和

def listapps():
....

如何基于给定的参数调用函数(仅此函数)? 我不想跑步

How can I call the function (and only this) based on the argument given? I don't want to run

if args.showtop20:
   #code here

if args.listapps:
   #code here

在以后要保持主可执行文件整洁的同时，我想将不同的功能移到模块上.

as I want to move the different functions to a module later on keeping the main executable file clean and tidy.

推荐答案

由于您似乎要根据给定的参数来运行一个且只有一个功能，因此建议您使用强制性位置参数./prog command ，而不是可选参数(./prog --command1或./prog --command2).

Since it seems like you want to run one, and only one, function depending on the arguments given, I would suggest you use a mandatory positional argument ./prog command, instead of optional arguments (./prog --command1 or ./prog --command2).

因此，应该执行以下操作:

so, something like this should do it:

FUNCTION_MAP = {'top20' : my_top20_func,
                'listapps' : my_listapps_func }

parser.add_argument('command', choices=FUNCTION_MAP.keys())

args = parser.parse_args()

func = FUNCTION_MAP[args.command]
func()

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