def ravel(self, order='C'):
        return np.array(self)
Set invoice status for historical (<2014) events.
dataset/ETHPy150Open pydata/pandas/pandas/core/categorical.py/Categorical.ravel--crossover with--dataset/ETHPy150Open swcarpentry/amy/workshops/migrations/0062_no_invoice_for_historic_events.py/no_invoice_for_historical_events