Update app.py

app.py

@@ -42,6 +42,7 @@ def identity(index, split):
     
 def save(index, language, split, prompt, completion):
     buffer = StringIO()
+    now = datetime.datetime.now()
     timestamp = datetime.datetime.now().strftime("%Y-%m-%dT%H:%M:%S.%f")
     file_name = f"prompts_{timestamp}.jsonl"
     if len(prompt) != 0 and len(completion) != 0 :