text: from typing import Any, Dict, List, Type, TypeVar, Union
  
  import attr
  
  from ..types import UNSET, Unset
  
  T = TypeVar("T", bound="FTPPassivePortRange")
  
  
  @attr.s(auto_attribs=True)
  class FTPPassivePortRange:
      """ """
  
      start: Union[Unset, int] = UNSET
      end: Union[Unset, int] = UNSET
      additional_properties: Dict[str, Any] = attr.ib(init=False, factory=dict)
  
      def to_dict(self) -> Dict[str, Any]:
          start = self.start
          end = self.end
  
          field_dict: Dict[str, Any] = {}
          field_dict.update(self.additional_properties)
          field_dict.update({})
          if start is not UNSET:
              field_dict["start"] = start
          if end is not UNSET:
              field_dict["end"] = end
  
          return field_dict
  
      @classmethod
      def from_dict(cls: Type[T], src_dict: Dict[str, Any]) -> T:
          d = src_dict.copy()
          start = d.pop("start", UNSET)
  
          end = d.pop("end", UNSET)
  
          ftp_passive_port_range = cls(
              start=start,
              end=end,
          )
  
          ftp_passive_port_range.additional_properties = d
          return ftp_passive_port_range
  
      @property
      def additional_keys(self) -> List[str]:
          return list(self.additional_properties.keys())
  
      def __getitem__(self, key: str) -> Any:
          return self.additional_properties[key]
  
      def __setitem__(self, key: str, value: Any) -> None:
          self.additional_properties[key] = value
  
      def __delitem__(self, key: str) -> None:
          del self.additional_properties[key]
  
      def __contains__(self, key: str) -> bool:
          return key in self.additional_properties
  