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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 return_value(self):
 """ Returns the value for this expectation or raises the proper exception. """

        if self._raises:
            # Handle exceptions
            if inspect.isclass(self._raises):
                raise self._raises()
            else:
                raise self._raises
        else:
            if isinstance(self._returns, tuple):
                return tuple([x.value if isinstance(x, Variable)
                             else x for x in self._returns])
            return self._returns.value if isinstance(self._returns, Variable) \
                else self._returns