fix TypeError: 'in <string>' requires string as left operand, not list

model.py

@@ -66,8 +66,8 @@ def model(passage, level):
   else:
     txt = passage
 
-  sentence_cutters = [".", "!", "?"]
-  if sentence_cutters in txt:
+  # sentence_cutters = [".", "!", "?"]
+  if ("." in txt) or ("!" in txt) or ("?" in txt):
     txt = (txt.split(".").split("!").split("?"))
   else:
     txt = txt