我该如何处理？ 试图获得结果以产生主机变量的名称

Question

#!/usr/bin/env python3

'''
Custom dynamic inventory script for ansible, in python
'''

# Importing modules needed
import os
import sys
import argparse

try:
    import json
except ImportError:
    import simplejson as json

class ExampleInventory(object):

    def __init__(self):
        self.inventory = {}
        self.read_cli_args()

        # Called with --list
        if self.arg.list:
            self.inventory = self.example_inventory()
        # Called with --host [hostname]
        elif self.arg.host:
            # Not implemented, since we return _meta info --list
            self.inventory = self.empty_inventory()
            # If no groups or vars are present, return an empty inventory 
        else:
            self.inventory = self.empty_inventory()

        print: json.dumps(self.inventory);

    # Example inventory for testing
    # This is hard coded, a more elegant one will probe an API which might be 

provided by cloud providers def example_inventory(self): return { "group": { "hosts": [ "172.31.30.220" "172.31.28.102" "172.31.32.33" "172.31.41.111" ], "vars": { "example_variable": "value" } }, "_meta":{ "hostvars": { "172.31.30.220": { "host_specific_vars": "web1" }, "172.31.28.102": { "host_specific_vars": "web2" }, "172.31.32.33": { "host_specific_vars": "db1" }, "172.31.41.111": { "host_specific_vars": "db2" } } } }

    # Empty inventory for testing:
    def empty_inventory(self):
        return {'_meta': {'hostvars': {}}}

    # Read the command line args passed to the script
    # Every inventory must provide this
    def read_cli_args(self):
        parser = argparse.ArgumentParser()
        parser.add_argument('--list', action = 'store_true')
        parser.add_argument('--hosts', action = 'store')
        self.args = parser.parse_args()

# Get the inventory.
ExampleInventory()


> Keep getting this error
...
Traceback (most recent call last):
  File "dynamic_inventory_example.py", line 84, in <module>
    ExampleInventory()
  File "dynamic_inventory_example.py", line 26, in __init__
    if self.arg.list:
AttributeError: 'ExampleInventory' object has no attribute 'arg'

Answer 1

Used as self.arg but set as self.args