How to use the azure-storage-common.azure.storage.common.models.LocationMode.PRIMARY function in azure-storage-common

def _set_next_host_location(self, context):
        '''
        A function which sets the next host location on the request, if applicable. 

        :param ~azure.storage.models.RetryContext context: 
            The retry context containing the previous host location and the request 
            to evaluate and possibly modify.
        '''
        if len(context.request.host_locations) > 1:
            # If there's more than one possible location, retry to the alternative
            if context.location_mode == LocationMode.PRIMARY:
                context.location_mode = LocationMode.SECONDARY

                # if targeting the emulator (with path style), change path instead of host
                if context.is_emulated:
                    # replace the first instance of primary account name with the secondary account name
                    context.request.path = context.request.path.replace(DEV_ACCOUNT_NAME, DEV_ACCOUNT_SECONDARY_NAME, 1)
                else:
                    context.request.host = context.request.host_locations.get(context.location_mode)
            else:
                context.location_mode = LocationMode.PRIMARY

                # if targeting the emulator (with path style), change path instead of host
                if context.is_emulated:
                    # replace the first instance of secondary account name with the primary account name
                    context.request.path = context.request.path.replace(DEV_ACCOUNT_SECONDARY_NAME, DEV_ACCOUNT_NAME, 1)
                else:

self.is_emulated = connection_params.is_emulated

        self.primary_endpoint = connection_params.primary_endpoint
        self.secondary_endpoint = connection_params.secondary_endpoint

        protocol = connection_params.protocol
        request_session = connection_params.request_session or requests.Session()
        socket_timeout = connection_params.socket_timeout or DEFAULT_SOCKET_TIMEOUT
        self._httpclient = _HTTPClient(
            protocol=protocol,
            session=request_session,
            timeout=socket_timeout,
        )

        self.retry = ExponentialRetry().retry
        self.location_mode = LocationMode.PRIMARY

        self.request_callback = None
        self.response_callback = None
        self.retry_callback = None
        self._X_MS_VERSION = DEFAULT_X_MS_VERSION
        self._USER_AGENT_STRING = DEFAULT_USER_AGENT_STRING

The retry context containing the previous host location and the request 
            to evaluate and possibly modify.
        '''
        if len(context.request.host_locations) > 1:
            # If there's more than one possible location, retry to the alternative
            if context.location_mode == LocationMode.PRIMARY:
                context.location_mode = LocationMode.SECONDARY

                # if targeting the emulator (with path style), change path instead of host
                if context.is_emulated:
                    # replace the first instance of primary account name with the secondary account name
                    context.request.path = context.request.path.replace(DEV_ACCOUNT_NAME, DEV_ACCOUNT_SECONDARY_NAME, 1)
                else:
                    context.request.host = context.request.host_locations.get(context.location_mode)
            else:
                context.location_mode = LocationMode.PRIMARY

                # if targeting the emulator (with path style), change path instead of host
                if context.is_emulated:
                    # replace the first instance of secondary account name with the primary account name
                    context.request.path = context.request.path.replace(DEV_ACCOUNT_SECONDARY_NAME, DEV_ACCOUNT_NAME, 1)
                else:
                    context.request.host = context.request.host_locations.get(context.location_mode)

def _get_host_locations(self, primary=True, secondary=False):
        locations = {}
        if primary:
            locations[LocationMode.PRIMARY] = self.primary_endpoint
        if secondary:
            locations[LocationMode.SECONDARY] = self.secondary_endpoint
        return locations