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The recency_end_date variable is referencing the user passed variable value and not the class attribute that is transformed using the strptime() function:
self.data = convert_transaction_to_user(self.data, recency_end_date=recency_end_date)
The variable should be prefixed with the self. keyword:
self.data = convert_transaction_to_user(self.data, recency_end_date=self.recency_end_date)
This is causing an issue when the recency_end_date value is passed to the convert_transaction_to_user() function, specifically on this line of code:
df_recency = df.groupby([id_col])[date_col].max().apply(lambda date: (end_date - date).days).astype(float)
TypeError: unsupported operand type(s) for -: 'str' and 'Timestamp'