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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 install_status(self, install_status):
 """Sets the install_status of this IntegrationStatus. Whether the customer or an automated process has installed the dashboards for this integration # noqa: E501 :param install_status: The install_status of this IntegrationStatus. # noqa: E501 :type: str """

        if install_status is None:
            raise ValueError("Invalid value for `install_status`, must not be `None`")  # noqa: E501
        allowed_values = ["UNDECIDED", "UNINSTALLED", "INSTALLED"]  # noqa: E501
        if install_status not in allowed_values:
            raise ValueError(
                "Invalid value for `install_status` ({0}), must be one of {1}"  # noqa: E501
                .format(install_status, allowed_values)
            )

        self._install_status = install_status