from pyVim.connect import SmartConnect, SmartConnectNoSSL, Disconnect
from pyVmomi import vim
import atexit

host = " "
user = " "
password = ' '

serviceInstance = SmartConnectNoSSL(host=host,
                               user=user,
                               pwd=password,
                               port=443)
atexit.register(Disconnect, serviceInstance)
content = serviceInstance.RetrieveContent()

def get_all_objs(content, vimtype):
    obj = {}
    container = content.viewManager.CreateContainerView(content.rootFolder, vimtype, True)
    for managed_object_ref in container.view:
            obj.update({managed_object_ref: managed_object_ref.name})
    return obj

# dvss = get_all_objs(content, [vim.DistributedVirtualSwitch])
# portgroups = get_all_objs(content, [vim.DistributedVirtualPortgroup])

children = content.rootFolder.childEntity
for child in children:  # Iterate though DataCenters
    dc = child
    clusters = dc.hostFolder.childEntity
    for cluster in clusters:  # Iterate through the clusters in the DC
        for network in cluster.network: # Iterate through the networks in the cluster
            name = network.name
            # print name
            try:
                vlan = network.config.defaultPortConfig.vlan.vlanId
                if isinstance(vlan, int):
                    count = 0
                    for vm in network.vm:
                        # print vm
                        count += 1
                    print("vmware_portgroup_connected_vms dc={0} cluster={1} portgroup={2} vlan={3} {4}".format(dc.name, cluster.name, name, vlan, count))
            except:
                print "exception"