Clean up code and implement best practices

[Vinalti]

Proposed changes

1. type(a) == list replaced with isinstance(a, list)

   That ensures that an inherited class of list is also recognized as list

2. a_dict['key'] replaced with a_dict.get('key')

   If the key doesn't exists the method .get("key") will return None instead of raising an exception

3. annotation -> list replaced by more accurate -> list[dict]

   Simple best practice for TypeHints

[lucasheld]

This module should be compatible with python 3.6. list[dict] is not supported in this version:

...
    def get_monitors(self) -> list[dict]:
TypeError: 'type' object is not subscriptable

[Vinalti]

Oh ok I see then I think that we should :

from __future__ import annotation

or

from Typing import List

#and use
List[dict]

[lucasheld]

Hmm, I noticed that Python 3.6 is end-of-life. Then I think we can just drop support for this version and add

from __future__ import annotations

With this import list[dict] is supported in Python 3.7 (PEP 563).

[lucasheld]

Thank you!