from dataclasses import dataclass from typing import Optional, Collection, Any from abc import abstractmethod class DeviceLifecycleState(Enum): INIT = "init" OPEN = "open" CLOSE = "close" class DevaceError(Exception): pass class NonReadableTrait(Exception): pass class NonWritableTrait(Exception): pass @dataclass class TraitDescriptor: name: str info: Optional[str] = None readable: bool = True writable: bool = False @dataclass class ActionDescriptor: name: str arguments: dict[str, type] info: Optional[str] = None class Device(ABC): # TODO(Homework #3) _state = DeviceLifecycleState.INIT @property def state(self) -> DeviceLifecycleState: return self._state def close(self): self._state = DeviceLifecycleState.CLOSE @property @abstractmethod def trait_descriptors(self) -> Collection[TraitDescriptor]: pass @property @abstractmethod def action_descriptors(self) -> Collection[ActionDescriptor]: pass @abstractmethod def __getitem__(self, trait_name: str) -> Optional[Any]: """Return logical state of trait `trait_name`.""" pass class SynchronyDevice(Device): def open(self): self._state = DeviceLifecycleState.OPEN @abstractmethod def execute(self, action_name: str, *args, **kwargs): """Execute action `action_name`, using `args` and `kwargs` as action argument.""" pass @abstractmethod def read(self, trait_name: str) -> Any: """Read physical state of trait `trait_name` from device.""" raise NonReadableTrait @abstractmethod def write(self, trait_name: str, value: Any) -> bool: """Pass `value` to trait `trait_name` of device.""" raise NonWritableTrait @abstractmethod def invalidate(self, trait_name: str): """Invalidate logical state of trait `trait_name`""" pass def close(self): return super().close()