def expire(self):
        del self.site.sessions[self.uid]
        for c in self.expireCallbacks:
            c()
        self.expireCallbacks = []
        if self._expireCall and self._expireCall.active():
            self._expireCall.cancel()
            # Break reference cycle.
            self._expireCall = None
odd_s: sum of values at odd position
dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/web/server.py/Session.expire--crossover with--dataset/ETHPy150Open algorhythms/LintCode/Coins in a Line III.py/Solution.firstWillWinEven