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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def interpret(self, iterable=None, poll_interval=0.2):
 """Interprets a sequence """

        if iterable is None:
            iterable = self.decode(poll_interval)
            if iterable is None:
                return None

        if isinstance(iterable, basestring):
            iterable = self.decode(poll_interval, iterable)

        return interpret_opcodes(iterable)