add stringify response

app.py

@@ -25,7 +25,7 @@ def pygen_func(code_nl):
     # prediction = req.request(CT5_METHOD, CT5_URL, data=payload)
     # prediction = req.request(CT5_METHOD, CT5_URL, json=req_data)
     # answer = json.loads(prediction.content.decode("utf-8"))
-    return 'BOOM! ' + output # + ' BOOM!!: ' + answer
+    return 'BOOM! ' + str(output) # + ' BOOM!!: ' + answer
 
 iface = gr.Interface(pygen_func, 
     [