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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 endpoint(self):
 """ The endpoint for this route. """

        if self._endpoint:
            return self._endpoint
        elif self._controller_cls:
            endpoint = f'{snake_case(self._controller_cls.__name__)}.{self.method_name}'
            return endpoint if not self.bp_name else f'{self.bp_name}.{endpoint}'
        elif self.bp_name:
            return f'{self.bp_name}.{self.method_name}'
        return f'{self.view_func.__module__}.{self.method_name}'