Whenever, I set static ip not work but dhcp work.How can I set static ip?

In [68]: customspec
Out[68]:
(vim.vm.customization.Specification) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
options = ,
identity = (vim.vm.customization.LinuxPrep) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
hostName = (vim.vm.customization.FixedName) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
name = 'test'
},
domain = '',
timeZone = ,
hwClockUTC =
},
globalIPSettings = (vim.vm.customization.GlobalIPSettings) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
dnsSuffixList = (str) [],
dnsServerList = (str) []
},
nicSettingMap = (vim.vm.customization.AdapterMapping) [
(vim.vm.customization.AdapterMapping) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
macAddress = ,
adapter = (vim.vm.customization.IPSettings) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
ip = (vim.vm.customization.FixedIp) {
dynamicType = ,
dynamicProperty = (vmodl.DynamicProperty) [],
ipAddress = '172.16.31.150'
},
subnetMask = '255.255.255.0',
gateway = '172.16.30.1',
ipV6Spec = ,
dnsServerList = (str) [],
dnsDomain = ,
primaryWINS = ,
secondaryWINS = ,
netBIOS =
}
}
],
encryptionKey = (byte) []
}

task = vm.Customize(spec=customspec)

vm.PowerOn()

Set static IP not work but it always dhcp an IP.How can I set static IP?
Thanks.

Start with the printed customization.Specification and the vm.Customize(spec=customspec) and vm.PowerOn() calls. Reproduce the customization and verify the guest's resulting network configuration; done means the configured fixed IP is applied instead of a DHCP address.