import asyncio class AsyncCounter(object): def __init__(self, stop=None): self.count = 0 self.stop = stop def __aiter__(self): return self async def __anext__(self): await asyncio.sleep(1) self.count += 1 if sel
import asyncio #异步迭代器协议实现 class AsyncIterator: def __init__(self, data): self.data = data self.iterator = None self.first = True def __aiter__(self): return self async def __anext__(self): if self.first: self.iterator = iter(self.data) self.first = False try: await ...
asyncdefmain(): data = await fetch_data()# 其他代码pass「break」用于跳出循环。for i in range(10):if i == 5:break print(i)「class」用于定义类。classDog:def__init__(self, name, breed): self.name = name self.breed = breed「continue」用于跳过循环的当前迭代的其余部分，然后...
我们可以在async for语句中使用异步迭代器。以下是一个使用异步上下文管理器和异步迭代器的例子：import asyncioclassAsyncIterable:def__init__(self, iterable): self.iterable = iterabledef__aiter__(self):return selfasyncdef__anext__(self):ifnot self.iterable:raise StopAsyncIterationreturn self.iterab...
class Person: def __init__(self, name: str, age: int): self.name = name self.age = age def __repr__(self): return f"Person(name={self.name}, age={self.age})"1.1.2 类型注解与Python 3.6以来的类型提示改进 从Python 3.6起,类型提示被正式纳入语言规范 ,允许我们在代码中明确指定变量和...
2、async和await关键字的用法 在Python中,可以通过使用async关键字定义协程函数,使用await关键字挂起协程的执行,等待耗时操作完成后再恢复执行。 highlighter- python importasyncioasyncdefhello():print("Hello")awaitasyncio.sleep(1)# 模拟耗时操作,挂起协程执行print("World")asyncio.run(hello()) ...
# asyncio.tasks.TaskclassTask(futures._PyFuture):def__init__(self, coro, *, loop=None, name=None):# 保存了协程函数self._coro = coro self._context = contextvars.copy_context()# 调用 loop call_soon 将 self.__step 加入到 loop 的队列中self._loop.call_soon(self.__step, context=self...
要继承AsyncConsumer类,我们需要创建一个新的类,并在类定义中指定AsyncConsumer作为父类。在这个新类中,我们可以重写父类的方法,添加自定义逻辑以满足特定的需求。 下面是一个简单的示例,展示了如何继承AsyncConsumer类并重写其init方法: fromchannels.generic.websocketimportAsyncWebsocketConsumerclassMyConsumer(AsyncWebsoc...
Notably, __init__ must always be synchronous even if all the class' methods are asynchronous. Function Calls So, now we have looked at the two different worlds, let's look at the main thing that can bridge between them - function calls. Inside of an async or sync function, you can ...
class AsyncContextManager: def __init__(self): self.conn = None async def do_something(self): # 异步操作数据库 return 666 async def __aenter__(self): # 异步链接数据库 self.conn = await asyncio.sleep(1) return self async def __aexit__(self, exc_type, exc, tb): ...