Push Me Pull You

Python

GNU GPL

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class PushMePullYou():
    def __init__(self, list):
        self.list = list
        self.index = 0
        self.total = len(list) - 1
        
    def next(self):
        if self.index >= self.total:
            self.index = 0
        else:
            self.index += 1

        return self.list[self.index]

    def previous(self):
        if self.index <= 0:
            self.index = self.total
        else:
            self.index -= 1

        return self.list[self.index]