service_instance = None
vcenter_host = "XYZ"
vcenter_port = X
vcenter_username = "XYZ"
vcenter_password = "XYZ"
vmName = "VM NAME";
try:
    #For trying to connect to VM
    service_instance = connect.SmartConnect(host=vcenter_host, user=vcenter_username, pwd=vcenter_password, port=vcenter_port, sslContext=context)

    atexit.register(connect.Disconnect, service_instance)

    content = service_instance.RetrieveContent()

    container = content.rootFolder  # starting point to look into
    viewType = [vim.VirtualMachine]  # object types to look for
    recursive = True  # whether we should look into it recursively
    containerView = content.viewManager.CreateContainerView(
    container, viewType, recursive)
    #getting all the VM's from the connection
    children = containerView.view
    #going 1 by 1 to every VM
    for child in children:
        vm = child.summary.config.name
        #check for the VM
        if(vm == vmName):
            vmSummary = child.summary
            #get the diskInfo of the selected VM
            info = vmSummary.vm.guest.disk
            #check for the freeSpace property of each disk
            for each in info:
                #To get the freeSPace in GB's
                diskFreeSpace = each.freeSpace/1024/1024/1024