Attach and Detach a Block Device to a Virtual_Guest

import SoftLayer
from pprint import pprint as pp

class example():

    def __init__(self):

        self.client = SoftLayer.Client()

    def main(self, image_id, guest_id):
        my_image = self.getMyImage(image_id)
        size = my_image.get("capacity", 100)
        """
        SAN based guests will throw the following exception:
        SoftLayer.exceptions.SoftLayerAPIError: SoftLayerAPIError(SoftLayer_Exception_Public): This guest is SAN-based, and does not require host migration for disk attachment.
        """
        available = self.client['SoftLayer_Virtual_Guest'].checkHostDiskAvailability(size,id=guest_id)
        # This should be True. False means the host doesn't have enough disk space to attach
        pp(available)

        attach = self.client['SoftLayer_Virtual_Guest'].attachDiskImage(image_id, id=guest_id)
        print("Attaching storage")
        pp(attach)

    def getImages(self):

        mask = "mask[type,blockDevices[guest]]"
        images = self.client['SoftLayer_Account'].getPortableStorageVolumes(mask=mask)

        for image in images:
            desc = image.get('description', "---")
            capacity = image.get('capacity', "0")
            print("%s - %s (%s) - %s " % 
                (image['id'], image['type']['keyName'], capacity ,desc)
            )
            for disk in image['blockDevices']:
                try:
                    hostname = disk['guest']['fullyQualifiedDomainName']
                except KeyError:
                    hostname = "None"
                print("\t%s" % hostname)

    def getMyImage(self,imageId):
        mask = "mask[blockDevices[guest],sourceDiskImage,type]"
        image = self.client['SoftLayer_Virtual_Disk_Image'].getObject(mask=mask,id=imageId)
        pp(image)
        return image


if __name__ == "__main__":
    image_id = 12345
    guest_id = 67890
    main = example()
    main.getImages()
    main.main(image_id, guest_id)
    # The new guest will only show up on the image once the migration transaction is completed
    main.getMyImage(image_id)