Update app.py

app.py

@@ -453,11 +453,20 @@ def answer_template(language="english"):
     </context>
     
     Question: {{question}}
-    
+    Language: {language}.
     
     """
     return template
 
+answer_prompt = ChatPromptTemplate.from_template(answer_template())
+
+# invoke the ChatPromptTemplate
+answer_prompt.invoke(
+    {"question":"plaese give more details about DTC, including its use cases and implementation.",
+     "context":[Document(page_content="DTC use cases include...")], # the context is a list of retrieved documents.
+     "chat_history":memory.chat_memory}
+)
+
 
 chain = ConversationalRetrievalChain.from_llm(
     condense_question_prompt=standalone_question_prompt,