i want shutdown eSXi host with python script can some1 help me ?

[Lasha Tsatsashvili]

import sys

from pysphere import VIServer, VITask, VIMor

from pysphere.vi_virtual_machine import VIVirtualMachine

from pysphere.resources import VimService_services as VI

server = VIServer()

try:

    server.connect('host', 'name', 'password')

except:

    print 'Could not estabilish connection!'

    sys.exit(2);

def host_mor(mor):

    if not VIMor.is_mor(mor):

        return VIMor(mor, "HostSystem")

    return mor

def enter_maintenance_mode(host, timeout, evacuate_powered_off_vms=None):

    host = host_mor(host)

    request = VI.EnterMaintenanceMode_TaskRequestMsg()

    _this = request.new__this(host)

    _this.set_attribute_type(host.get_attribute_type())

    request.set_element__this(_this)

    request.set_element_timeout(timeout)

    if evacuate_powered_off_vms in [False, True]:

        request.set_element_evacuatePoweredOffVms(evacuate_powered_off_vms)

    task = server._proxy.EnterMaintenanceMode_Task(request)._returnval

    return VITask(task, server)

def shutdown_host(host, force):

    host = host_mor(host)

    request = VI.ShutdownHost_TaskRequestMsg()

    _this = request.new__this(host)

    _this.set_attribute_type(host.get_attribute_type())

    request.set_element__this(_this)

    request.set_element_force(force)

    task = server._proxy.ShutdownHost_Task(request)._returnval

    return VITask(task, server)

def suspend_all_powered_on_vms():

    for path in server.get_registered_vms(status='poweredOn'):

        vm = server.get_vm_by_path(path)

        vm.suspend(sync_run=False)

def migrate_powered_on_vms(from_host, to_host):

    from_host = host_mor(from_host)

    to_host = host_mor(to_host)

    props = ['runtime.powerState']

    oc = server._retrieve_properties_traversal(property_names=props,

                                               from_node=from_host,

                                               obj_type='VirtualMachine')

    for o in oc:

        powered_on = False

        if hasattr(o, "PropSet") and o.PropSet:

            for p in o.PropSet:

                if p.Name=='runtime.powerState' and p.Val == 'poweredOn':

                    vm = VIVirtualMachine(server, o.Obj)

                    vm.migrate(sync_run=False, host=to_host)

# Here I need to set the host (the esxi itself)

host = VIMor(server, "HostSystem")

print "Entering maintenance mode..."

task = enter_maintenance_mode(host, 10)

print "State: ",task.get_state()

#print "Suspending all VMs..."

suspend_all_powered_on_vms()

print "Done"

#print "Shutdown host..."

shutdown_host(host, True)

server.disconnect()

i find this code but it doesnot work it throw error like this:

Traceback (most recent call last):

  File "C:\Python27\tutorial\vmware.py", line 72, in <module>

    task = server._proxy.ShutdownHost_Task(request)._returnval

  File "C:\Python27\lib\site-packages\pysphere\resources\VimService_services.py", line 1314, in ShutdownHost_Task

    response = self.binding.Receive(ShutdownHost_TaskResponseMsg.typecode)

  File "C:\Python27\lib\site-packages\pysphere\ZSI\client.py", line 545, in Receive

    return _Binding.Receive(self, replytype, **kw)

  File "C:\Python27\lib\site-packages\pysphere\ZSI\client.py", line 464, in Receive

    raise FaultException(msg)

FaultException: The object has already been deleted or has not been completely created

<pysphere.resources.VimService_services_types.ManagedObjectNotFoundFault_Dec_Holder object at 0x0000000005AE5160>

can someone help me