Update app.py

app.py

@@ -18,7 +18,7 @@ def codeinterpreter(openai_key,prompt, files):
             fileList.append(file)
 
     if openai_api_key == "":
-        return ['openai key must set!'，None]
+        return ['openai key must set!',None]
 
     with CodeInterpreterSession(model="gpt-3.5-turbo",openai_api_key=openai_key) as session:
     #async with CodeInterpreterSession(model="gpt-3.5-turbo",openai_api_key="") as session: