class_docstr: A helper class that represents input string that to be modified.
docstr: :param string|int|list field_value: The string that Field represents.
  :param str field_type: field value type
docstr_tok: [":","param","string|int|list","field_value",":","The","string","that","Field","represents",".",":","param","str","field_type",":","field","value","type"]
code: def __init__(self, field_value, field_type=str, **kwargs):
      r"""
      :param string|int|list field_value: The string that Field represents.
      :param str field_type: field value type
  
      """
      self._field_type = field_type
      self.field_value = field_value
  
label_desc: Use image node_id 1 to create a new Field object  with example: obj = Field(field_value, field_type)