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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 _setup(self):
 """ Perform initial setup of the settings class, such as getting the settings module and setting the settings """

        settings_module  = None
        #Get the settings module from the environment variables
        try:
            settings_module = os.environ[global_settings.MODULE_VARIABLE]
        except KeyError:
            error_message = "Settings not properly configured.  Cannot find the environment variable {0}".format(global_settings.MODULE_VARIABLE)
            log.exception(error_message)

        self._initialize(settings_module)
        self._configure_logging()