get_bandwidth_data.py

import SoftLayer.API

apiUsername = ''
apiKey = ''

client = SoftLayer.Client(
    username=apiUsername,
    api_key=apiKey,
)

servers = [1, 2, 3]

data = {}
for server in servers:
    bandwidth_data = client['Hardware_Server'].getObject(id=server, mask='mask[hostname,currentBillableBandwidthUsage]')
    data[bandwidth_data['hostname']] = float(bandwidth_data['currentBillableBandwidthUsage'])

for server, value in data.items():
    line = '%s: %sGB' % (server, value)
    print(line)
print('Total: ' + str(sum(data.values())) + 'GB')