docs: def _user_input_properties():
      """ User input the properties of guest, image, and network. """
      global GUEST_USERID
      global GUEST_PROFILE
      global GUEST_VCPUS
      global GUEST_MEMORY
      global GUEST_ROOT_DISK_SIZE
      global DISK_POOL
      global IMAGE_PATH
      global IMAGE_OS_VERSION
      global GUEST_IP_ADDR
      global GATEWAY
      global CIDR
      global VSWITCH_NAME
      global NETWORK_INFO
      global DISKS_LIST
      
      pythonVersion = sys.version[0]
      print("Your python interpreter's version is %s." % pythonVersion)
  
      if pythonVersion == '2':
          print("Input properties with string type in ''.")
      else:
          print("Input properties without ''.")
  
      print("Please input guest properties:")
  
      GUEST_USERID = input("guest_userid = ")
      GUEST_PROFILE = input("guest_profile = ")
      GUEST_VCPUS = int(input("guest_vcpus = "))
      GUEST_MEMORY = int(input("guest_memory (in Megabytes) = "))
      GUEST_ROOT_DISK_SIZE = int(input("guest_root_disk_size (in Gigabytes) = "))
      GUEST_POOL = input("disk_pool = ")
      print("\n")
  
      IMAGE_PATH = input("image_path = ")
      IMAGE_OS_VERSION = input("image_os_version = ")
      print("\n")
  
      GUEST_IP_ADDR = input("guest_ip_addr = ")
      GATEWAY = input("gateway = ")
      CIDR = input("cidr = ")
      VSWITCH_NAME = input("vswitch_name = ")
  
      NETWORK_INFO = [{'ip_addr': GUEST_IP_ADDR, 'gateway_addr': GATEWAY, 'cidr': CIDR}]
      DISKS_LIST = [{'size': '%dg' % GUEST_ROOT_DISK_SIZE, 
                     'is_boot_disk': True, 'disk_pool': GUEST_POOL}]