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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def vm_configured(name, vm_name, cpu, memory, image, version, interfaces,
                  disks, scsi_devices, serial_ports, datacenter, datastore,
                  placement, cd_dvd_drives=None, sata_controllers=None,
                  advanced_configs=None, template=None, tools=True,
                  power_on=False, deploy=False):
    '''
    Selects the correct operation to be executed on a virtual machine, non
    existing machines will be created, existing ones will be updated if the
    config differs.
    '''
    result = {'name': name,
              'result': None,
              'changes': {},
              'comment': ''}

    log.trace('Validating virtual machine configuration')
    schema = ESXVirtualMachineConfigSchema.serialize()
    log.trace('schema = %s', schema)
    try:
        jsonschema.validate({'vm_name': vm_name,
                             'cpu': cpu,
                             'memory': memory,
                             'image': image,
                             'version': version,
                             'interfaces': interfaces,
                             'disks': disks,
                             'scsi_devices': scsi_devices,
                             'serial_ports': serial_ports,
                             'cd_dvd_drives': cd_dvd_drives,
                             'sata_controllers': sata_controllers,
                             'datacenter': datacenter,
                             'datastore': datastore,
                             'placement': placement,
                             'template': template,
                             'tools': tools,
                             'power_on': power_on,
                             'deploy': deploy}, schema)
    except jsonschema.exceptions.ValidationError as exc:
        raise salt.exceptions.InvalidConfigError(exc)

    service_instance = __salt__['vsphere.get_service_instance_via_proxy']()
    try:
        __salt__['vsphere.get_vm'](vm_name, vm_properties=['name'],
                                   service_instance=service_instance)
    except salt.exceptions.VMwareObjectRetrievalError:
        vm_file = __salt__['vsphere.get_vm_config_file'](
            vm_name, datacenter,
            placement, datastore,
            service_instance=service_instance)
        if vm_file:
            if __opts__['test']:
                result.update({'comment': 'The virtual machine {0}'
                                          ' will be registered.'.format(vm_name)})
                __salt__['vsphere.disconnect'](service_instance)
                return result
            result = vm_registered(vm_name, datacenter, placement,
                                   vm_file, power_on=power_on)
            return result
        else:
            if __opts__['test']:
                result.update({'comment': 'The virtual machine {0}'
                                          ' will be created.'.format(vm_name)})
                __salt__['vsphere.disconnect'](service_instance)
                return result
            if template:
                result = vm_cloned(name)
            else:
                result = vm_created(name, vm_name, cpu, memory, image, version,
                                    interfaces, disks, scsi_devices,
                                    serial_ports, datacenter, datastore,
                                    placement, cd_dvd_drives=cd_dvd_drives,
                                    advanced_configs=advanced_configs,
                                    power_on=power_on)
            return result

    result = vm_updated(name, vm_name, cpu, memory, image, version,
                        interfaces, disks, scsi_devices,
                        serial_ports, datacenter, datastore,
                        cd_dvd_drives=cd_dvd_drives,
                        sata_controllers=sata_controllers,
                        advanced_configs=advanced_configs,
                        power_on=power_on)
    __salt__['vsphere.disconnect'](service_instance)

    log.trace(result)
    return result