CODEWITHSUNDEEP
python
wuki
wuki

Reputation: 109

Understanding .get() method for nested dictionaries

I have the following nested dictionary and I'm trying to return the boolean of the value to the ['is_up'] key inside of a function:

ios_output = {'global': {'router_id': '10.10.10.1',
  'peers': {'10.10.10.2': {'local_as': 100,
    'remote_as': 100,
    'remote_id': '0.0.0.0',
    'is_up': False,
    'is_enabled': True,
    'description': '',
    'uptime': -1,
    'address_family': {'ipv4': {'received_prefixes': -1,
      'accepted_prefixes': -1,
      'sent_prefixes': -1}}},
   '10.10.10.3': {'local_as': 100,
    'remote_as': 100,
    'remote_id': '0.0.0.0',
    'is_up': False,
    'is_enabled': True,
    'description': '',
    'uptime': -1,
    'address_family': {'ipv4': {'received_prefixes': -1,
      'accepted_prefixes': -1,
      'sent_prefixes': -1}}},
   '10.10.10.5': {'local_as': 100,
    'remote_as': 100,
    'remote_id': '172.16.28.149',
    'is_up': True,
    'is_enabled': True,
    'description': '',
    'uptime': 3098,
    'address_family': {'ipv4': {'received_prefixes': 0,
      'accepted_prefixes': 0,
      'sent_prefixes': 0}}}}}}

The only way I've been able to get this work is by using a nested for loop:

for k, v in ios_output.items():
    for y in v.values():
        if type(y) == dict:
            for z in y.values():
                return z['is_up'] == True

When I replace the nested loop with this line:

return ios_output.get('global').get('peers').get('10.10.10.1').get('is_up') == True

I get:

AttributeError: 'NoneType' object has no attribute 'get' dictionary

I'm of the opinion that there's got to be a better way to than leveraging a nested loop - which is why I'm attempting to use the .get() method but I believe I'm missing something. Thoughts?

Upvotes: 1

Views: 77

Answers (1)

Alexander Ejbekov
Alexander Ejbekov

Reputation: 5950

10.10.10.1 is not present in your dict, hence the AttributeError.

That said, the get method accepts a second, default parameter, which is None by default.

That said, if you want to reach the specific node, you need to pass a second parameter, which would be an empty dict:

return ios_output.get('global', {}).get('peers', {}).get('10.10.10.1', {}).get('is_up')

Which, given that 10.10.10.1 doesn't exist would return None

Upvotes: 3

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