def numwatchers(self):
        return len(self.watchers)
Set up a store with a location, a player and an observer.
dataset/ETHPy150Open circus-tent/circus/circus/arbiter.py/Arbiter.numwatchers--crossover with--dataset/ETHPy150Open twisted/imaginary/imaginary/test/commandutils.py/CommandTestCaseMixin.setUp