Python - Get values from dicts when key is a label

Question

im trying to access to some values where the keys are a special variable (label).

The main_dict is the following and was generated by jsondiff.diff module:

{18: {'value': '5002'}, 26: {'value': 'http://config-service:8080/'}, insert: [(19, {'name': 'alfalfa', 'value': 'alfalfa1'})], delete: [27]}

Where "label" and "delete" has this special attributes.

When i try to show the keys from the dict the output is :

main_dict[k].keys()
dict_keys([18, 26, insert, delete])

But when i try get the values of this keys, python output report the following errors:

main_dict[k]['insert']
Traceback (most recent call last):
  File "<string>", line 1, in <module>
KeyError: 'insert'

main_dict[k]['delete']
Traceback (most recent call last):
  File "<string>", line 1, in <module>
KeyError: 'delete'

Thank you in advance