Update PxCorpus.py

PxCorpus.py

@@ -74,9 +74,9 @@ class StringIndex:
             print(key in self.vocab_struct)
         
         if (key in self.vocab_struct) == False:
-            return False
+            return "is_oov"
         
-        return t in self.vocab_struct[key]
+        return "is_not_oov" if t in self.vocab_struct[key] else "is_oov"
 
 _VOCAB = StringIndex(vocab=open("./vocabulary_nachos_lowercased.txt","r").read().split("\n"))