Softlayer service call to “getSnapshotPercentage”

I wrote the following logic to get the Snapshot Percentage, and am getting the below error. NOTE, I have tried this with both the Network_Storage, and Network_Storage_Iscsi and am seeing the same response for both cases. Is there a workaround or is this a bug?

def get_snapshot_space(sl_config, iscsi_identifier):
    """ get the total number of Snapshot Space remaining"""
    snapshot_percentage = SL.instance(sl_config).net.getSnapshotPercentage(id=iscsi_identifier);
    print "Snapshot Space Used: \% %s " % snapshot_space;

ERROR:

 snapshot_percentage = SL.instance(sl_config).net.getSnapshotPercentage(id=iscsi_identifier);
  File "/usr/lib/python2.7/site-packages/SoftLayer-5.1.0-
py2.7.egg/SoftLayer/API.py", line 375, in call_handler
    return self(name, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/SoftLayer-5.1.0-

py2.7.egg/SoftLayer/API.py", line 343, in call
    return self.client.call(self.name, name, *args, **kwargs)
  File "/usr/lib/python2.7/site-packages/SoftLayer-5.1.0-

py2.7.egg/SoftLayer/API.py", line 246, in call
    return self.transport(request)
  File "/usr/lib/python2.7/site-packages/SoftLayer-5.1.0-

py2.7.egg/SoftLayer/transports.py", line 187, in __call__
    raise _ex(ex.faultCode, ex.faultString)
SoftLayer.exceptions.SoftLayerAPIError: SoftLayerAPIError(Client): Function ("getSnapshotPercentage") is not a valid method for this service

Also, I have noticed that on the softLayer Portal, the representation of the percentage is incorrect sometimes? It's been well over an hour since I have cleared all snapshots.

The method is currently deprecated so you could use an object mask to retrieve the bytesUsed and snapshotCapacityGb attributes.

The next script generates the snapshot space available that's displayed in the UI portal.

"""
Retrieves snapshot space.

See below references for more details.
Important manual pages:
http://sldn.softlayer.com/reference/datatypes/SoftLayer_Network_Storage
@License: http://sldn.softlayer.com/article/License
@Author: SoftLayer Technologies, Inc. <sldn@softlayer.com>
"""

import SoftLayer

USERNAME = 'set me'
API_KEY = 'set me'

client = SoftLayer.create_client_from_env(username=USERNAME, api_key=API_KEY)
networkStorageService = client['SoftLayer_Network_Storage']

iscsiStorageId = 1234567
objectMask = 'mask[snapshotCapacityGb,snapshots[bytesUsed,snapshotSizeBytes,snapshotSpaceAvailable]]'

try:
    storage = networkStorageService.getObject(mask=objectMask, id=iscsiStorageId)
    capacity = long(float(storage['snapshotCapacityGb'])) * 1e+9
    used_space = 0
    for child in storage['snapshots']:
        used_space = used_space + long(float(child['snapshotSizeBytes']))
    snapshot_space = (capacity - used_space) / 1e+9    
    print snapshot_space   
except SoftLayer.SoftLayerAPIError as e:
    print('Failed ... faultCode=%s, faultString=%s'
        % (e.faultCode, e.faultString))

Regarding the snapshot space representation in the UI, it's updated each hour more or less.

I hope this could help you.