def count_tickets(self):
        raise NotImplementedError()
Asserts that `topic` is NOT a function.
dataset/ETHPy150Open getlogbook/logbook/logbook/ticketing.py/BackendBase.count_tickets--crossover with--dataset/ETHPy150Open heynemann/preggy/preggy/assertions/types/function.py/not_to_be_a_function