AttributeError：“命名空间”object 没有属性“rmvApp”

Question

我试图在我的脚本中添加 2 个选项，“add”和“rmv”，但是当我使用 add 选项时，我得到了这个错误：

回溯（最后一次调用）：文件“/home/bsony/bin/moveVM”，第 240 行，在 elif(args.rmvApp) 中：AttributeError: 'Namespace' object 没有属性 'rmvApp'

反之亦然，当我使用 rmv 选项时，我收到此错误：

回溯（最后一次调用）：文件“/home/bsony/bin/moveVM”，第 238 行，在 if (args.addApp): AttributeError: 'Namespace' object has no attribute 'addApp'

相关代码截图如下：

#Set main parser
parser = argparse.ArgumentParser(description='A scirpt to add, move or remove     apps file the various apps file')
sub_parser = parser.add_subparsers(dest='command')

#Set add parser
addApp = sub_parser.add_parser('add', help='Add new app to apps file')
addApp.add_argument('-a', '--add', dest='addApp', type=str, help='The application you want to add to the apps file')

#Set remove parser
rmvApp = sub_parser.add_parser('rmv', help='Remove app from apps file')
rmvApp.add_argument('-r', '--rmv', dest='rmvApp', type=str, help='The application you want to remove from the apps file')

args = parser.parse_args()

#Dictionary to store variables making it easier to pass between functions
appDict = {
    "environment": "",
    "appToAdd": "",
    "appToRmv": "",
    "appToMove": "",
    "realEnv": "",
    "newHost": "",
    "newVMID": "",
    "oldAppLine": "",
    "newAppLine": "",
    "oldPRLines": []
}

appsFileList = [] #empty list to ingest apps file to

#Get evironment name for apps file
appDict["environment"] = raw_input('What environment would you like to move an app from? (dev, pt, pr): ').lower()

if (appDict["environment"] not in ["dev", "ppe", "pt", "pr"]):
    print("\nYou did not enter a valid environment...exiting...")
    exit()

#Set apps file location
userID = getpass.getuser() #gets linux user ID to use in appsFilePath

#check for add or remove flags and call function if flags are used
if (args.addApp):
    addApp(appsFileList, appDict, appsFilePath, userID)

if(args.rmvApp):
    rmvApp(appsFileList, appDict)

Answer 1

您需要先查看指定了哪个命令，然后才能访问特定于命令的 arguments。 所以你可以这样做：

if args.command == 'add':
    print(args.addApp)
elif args.command == 'rmv':
    print(args.rmvApp)
else:
    print("No command specified")

只有指定命令的子解析器 arguments 才会出现。