Refactor app.py: streamline imports, replace app_tokens with environment variables for model configuration

app.py

@@ -1,14 +1,12 @@
 import os
 import gradio as gr
 import requests
-import inspect
 import pandas as pd
-from smolagents import CodeAgent, HfApiModel, FinalAnswerTool, DuckDuckGoSearchTool, AzureOpenAIServerModel
+from smolagents import AzureOpenAIServerModel
 from huggingface_hub import login
+from dotenv import load_dotenv
 
-import app_tokens
-
-login(os.getenv('HF_API_KEY'))
+load_dotenv()  # take environment variables
 
 # Since I use a private endpoint behind a VPN, I coded app-test.py to fulfill the tasks, gather the answers and submit them
 # without Gradio to the server. 
@@ -18,10 +16,10 @@ login(os.getenv('HF_API_KEY'))
 DEFAULT_API_URL = "https://agents-course-unit4-scoring.hf.space"
 
 model = AzureOpenAIServerModel(
-    model_id = app_tokens.AZURE_OPENAI_MODEL,
-    azure_endpoint = app_tokens.AZURE_OPENAI_ENDPOINT,
-    api_key = app_tokens.AZURE_OPENAI_API_KEY,
-    api_version = app_tokens.OPENAI_API_VERSION    
+    model_id = os.getenv("AZURE_OPENAI_MODEL"),
+    azure_endpoint = os.getenv("AZURE_OPENAI_ENDPOINT"),
+    api_key = os.getenv("AZURE_OPENAI_API_KEY"),
+    api_version = os.getenv("app_tokens.OPENAI_API_VERSION")    
 )
 
 def run_and_submit_all( profile: gr.OAuthProfile | None):