configuration: minor improvements / fixes

Could not extend the subclass of 'TypedDict' the way I wanted, so I switched to 'dataclass'.

tests/test_main.py

@@ -5,7 +5,7 @@ import argparse
 from chatmastermind.utils import terminal_width
 from chatmastermind.main import create_parser, ask_cmd
 from chatmastermind.api_client import ai
-from chatmastermind.configuration import Config, OpenAIConfig
+from chatmastermind.configuration import Config
 from chatmastermind.storage import create_chat_hist, save_answers, dump_data
 from unittest import mock
 from unittest.mock import patch, MagicMock, Mock, ANY
@@ -19,18 +19,16 @@ class CmmTestCase(unittest.TestCase):
         """
         Creates a dummy configuration.
         """
-        return Config(
-            system='dummy_system',
-            db=db,
-            openai=OpenAIConfig(
-                api_key='dummy_key',
-                model='dummy_model',
-                max_tokens=4000,
-                temperature=1.0,
-                top_p=1,
-                frequency_penalty=0,
-                presence_penalty=0
-            )
+        return Config.from_dict(
+            {'system': 'dummy_system',
+             'db': db,
+             'openai': {'api_key': 'dummy_key',
+                        'model': 'dummy_model',
+                        'max_tokens': 4000,
+                        'temperature': 1.0,
+                        'top_p': 1,
+                        'frequency_penalty': 0,
+                        'presence_penalty': 0}}
         )
 
 
@@ -55,7 +53,7 @@ class TestCreateChat(CmmTestCase):
 
         self.assertEqual(len(test_chat), 4)
         self.assertEqual(test_chat[0],
-                         {'role': 'system', 'content': self.config['system']})
+                         {'role': 'system', 'content': self.config.system})
         self.assertEqual(test_chat[1],
                          {'role': 'user', 'content': 'test_content'})
         self.assertEqual(test_chat[2],
@@ -77,7 +75,7 @@ class TestCreateChat(CmmTestCase):
 
         self.assertEqual(len(test_chat), 2)
         self.assertEqual(test_chat[0],
-                         {'role': 'system', 'content': self.config['system']})
+                         {'role': 'system', 'content': self.config.system})
         self.assertEqual(test_chat[1],
                          {'role': 'user', 'content': self.question})
 
@@ -100,7 +98,7 @@ class TestCreateChat(CmmTestCase):
 
         self.assertEqual(len(test_chat), 6)
         self.assertEqual(test_chat[0],
-                         {'role': 'system', 'content': self.config['system']})
+                         {'role': 'system', 'content': self.config.system})
         self.assertEqual(test_chat[1],
                          {'role': 'user', 'content': 'test_content'})
         self.assertEqual(test_chat[2],
@@ -209,9 +207,9 @@ class TestAI(CmmTestCase):
 
         chat = [{"role": "system", "content": "hello ai"}]
         config = self.dummy_config(db='dummy')
-        config['openai']['model'] = "text-davinci-002"
-        config['openai']['max_tokens'] = 150
-        config['openai']['temperature'] = 0.5
+        config.openai.model = "text-davinci-002"
+        config.openai.max_tokens = 150
+        config.openai.temperature = 0.5
 
         result = ai(chat, config, 2)
         expected_result = (['response_text_1', 'response_text_2'],