refactor: make Config and Credentials read-only

Author: lpm0073

models/const.py

@@ -27,7 +27,16 @@
     raise FileNotFoundError("No .env file found in root directory of repository")
 
 
-class Config:
+class ReadOnly(type):
+    """Metaclass to make all class attributes read-only."""
+
+    def __setattr__(cls, name, value):
+        if name in cls.__dict__:
+            raise TypeError(f"Cannot change a read-only attribute {name}")
+        super().__setattr__(name, value)
+
+
+class Config(metaclass=ReadOnly):
     """Configuration parameters."""
 
     DEBUG_MODE: bool = DEBUG_MODE
@@ -41,7 +50,7 @@ class Config:
     PINECONE_VECTORSTORE_TEXT_KEY: str = PINECONE_VECTORSTORE_TEXT_KEY
 
 
-class Credentials:
+class Credentials(metaclass=ReadOnly):
     """Credentials."""
 
     OPENAI_API_KEY = OPENAI_API_KEY

models/yt.py

@@ -37,6 +37,8 @@
 # 8.) LangChain agents
 from langchain_experimental.agents.agent_toolkits.python.base import create_python_agent
 
+from models.const import Config, Credentials
+
 
 # Load environment variables from .env file in all folders
 # pylint: disable=duplicate-code
@@ -45,8 +47,6 @@
     load_dotenv(dotenv_path=dotenv_path, verbose=True)
     OPENAI_API_KEY = os.environ["OPENAI_API_KEY"]
     OPENAI_API_ORGANIZATION = os.environ["OPENAI_API_ORGANIZATION"]
-    PINECONE_API_KEY = os.environ["PINECONE_API_KEY"]
-    PINECONE_ENVIRONMENT = os.environ["PINECONE_ENVIRONMENT"]
 else:
     raise FileNotFoundError("No .env file found in root directory of repository")
 
@@ -66,7 +66,7 @@ class LangChainDev:
         tool=PythonREPL(),
         verbose=True,
     )
-    pinecone.init(api_key=PINECONE_API_KEY, environment=PINECONE_ENVIRONMENT)  # minute 10:43
+    pinecone.init(api_key=Credentials.PINECONE_API_KEY, environment=Config.PINECONE_ENVIRONMENT)  # minute 10:43
 
     # LLM wrappers. minute 5:46
     def test_01_basic(self):