Update app.py

app.py

@@ -27,12 +27,12 @@ def get_credentials():
 # pass
 os.environ["GOOGLE_APPLICATION_CREDENTIALS"]= get_credentials()
 
-NEO4J_URI = os.getenv("NEO4J_URI", "")
+NEO4J_URI = os.environ.get("NEO4J_URI")
 print(NEO4J_URI)
-NEO4J_USERNAME = os.getenv("NEO4J_USERNAME","")
-NEO4J_PASSWORD = os.getenv("NEO4J_PASSWORD","")
-project_id = os.getenv("PROJECT_ID","")
-location = os.getenv("LOCATION","")
+NEO4J_USERNAME = os.environ.get("NEO4J_USERNAME")
+NEO4J_PASSWORD = os.environ.get("NEO4J_PASSWORD")
+project_id = os.environ.get("PROJECT_ID")
+location = os.environ.get("LOCATION")
 
 vertexai.init(project=project_id, location=location)
   
@@ -74,9 +74,9 @@ CYPHER_GENERATION_PROMPT = PromptTemplate(
 )
 
 graph = Neo4jGraph(
-    url="{NEO4J_URI}", 
-    username="{NEO4J_USERNAME}", 
-    password="{NEO4J_PASSWORD}"
+    url=NEO4J_URI, 
+    username=NEO4J_USERNAME, 
+    password=NEO4J_PASSWORD
 )
 
 chain = GraphCypherQAChain.from_llm(