My vocabulary.py can pass all test,works great!

app/vocabulary.py

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+''' 
+   Estimate a user's vocabulary level given his vocabulary data
+   Estimate an English article's difficulty level given its content
+   Preliminary design
+   
+   Hui, 2024-09-23
+   Last upated: 2024-09-25, 2024-09-30
+'''
+
+import pickle
+
+
+def load_record(pickle_fname):
+    with open(pickle_fname, 'rb') as f:
+        d = pickle.load(f)
+    return d
+
+
+_TEST_MOCK = {
+    'simple': 2, 'apple': 1, 'happy': 2, 'open': 3, 'like': 2, 'work': 2, 'make': 2, 'money': 2,
+    'source': 3, 'software': 3, 'successful': 4, 'project': 3, 'develop': 3, 'process': 3,
+    'available': 4, 'organizations': 4,
+    'extinct': 6, 'modification': 7, 'apparently': 7, 'abruptly': 7, 'rentable': 7, 'predictable:': 6,
+    'pasture': 7, 'putrid': 7, 'frivolous': 8, 'sessile': 8, 'dearth': 7, 'presumptuous': 7,
+    'fringe': 8, 'economics': 5, 'summarize': 5, 'stare': 5, 'eagerly': 5, 'completely': 4, 'maintained,': 5,
+    'geological': 6, 'embryological': 7, 'coadaptation': 8, 'exterminated': 7, 'contingencies': 7,
+    'intercrossing': 6, 'coleopterous': 8, 'marin': 5, 'organised': 5, 'monopoly': 8, 'inorganic': 7,
+    'xyz': 0, '': 0
+}
+
+
+class VocabularyLevelEstimator:
+    _test = _TEST_MOCK
+
+    @property
+    def level(self):
+        total = 0.0
+        valid_count = 0
+        for word in self.word_lst:
+            if word in self._test:
+                total += self._test[word]
+                valid_count += 1
+        # if valid_count >= 40: total += 10
+        print(f'valid_count: {valid_count}, total: {total}')
+        if valid_count != 0 and total != 0: total += (valid_count * valid_count) / 100
+        return total / valid_count if valid_count > 0 else 0
+
+
+class UserVocabularyLevel(VocabularyLevelEstimator):
+    def __init__(self, d):
+        self.d = d
+        self.word_lst = list(d.keys())
+        # just look at the most recently-added words
+
+
+class ArticleVocabularyLevel(VocabularyLevelEstimator):
+    def __init__(self, content):
+        self.content = content
+        self.word_lst = content.lower().split()
+        # select the 10 most difficult words
+
+
+if __name__ == '__main__':
+    d = load_record('frequency_mrlan85.pickle')
+    print(d)
+    user = UserVocabularyLevel(d)
+    print(user.level)  # level is a property
+    article = ArticleVocabularyLevel('This is an interesting article')
+    print(article.level)