added sources list

app.py

@@ -38,10 +38,13 @@ def add_text(history, text):
 def bot(history):
     response = infer(history[-1][0])
     history[-1][1] = response['result']
-    return history
+    sources = [doc.metadata.get("source") for doc in response['source_documents']]
+    src_list = '\n'.join(sources)
+    print_this = response['result']+"\n\n\n Sources: \n\n\n"+src_list
+   # return history
+    return print_this
 
-def infer(question):
-    
+def infer(question):  
     query = question
     result = qa({"query": query})
     return result