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transformers.py

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+from sklearn.base import BaseEstimator, TransformerMixin
+
+class UnitPriceTransformer(BaseEstimator, TransformerMixin):
+    def fit(self, X, y=None):
+        return self
+
+    def transform(self, X):
+        X['unit_price'] = X['sales'] / X['quantity']
+        return X
+# Include other custom transformers as needed