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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 tile_is_valid(self):
 """ Checks if tile has tile info and valid timestamp :return: `True` if tile is valid and `False` otherwise :rtype: bool """

        return self.tile_info is not None \
            and (self.datetime == self.date or self.datetime == self.parse_datetime(self.tile_info['timestamp']))