使用类和 Python asyncio 的正确方法

Question

当使用 Python asyncio 时，处理阻塞 class 的正确方法是什么？

例如：

import asyncio
import time

class getImage(object):
    def __init__(self,):
        time.sleep(0.5)
        self.image_sim = "image"


async def main():
    print('starting main loop')
    func1 = asyncio.create_task(my_func1())
    print("Waiting for func1 to complete") 
    await func1
    print('finished main loop')

async def my_func1():
    print("starting func1")
    image = getImage()
    print(image.image_sim)
    print('done func 1')

asyncio.run(main(), debug=True)

这是正确的，还是有更多的'asyncio'方法来做到这一点？

我尝试将 async 添加到 init 函数中，稍后再添加 await：

class getImage(object):
    async def __init__(self,):
        time.sleep(0.05)
        self.image_sim = "image"


async def main():
    print('starting main loop')
    func1 = asyncio.create_task(my_func1())
    print("Waiting for func1 to complete") 
    await func1
    print('finished main loop')

async def my_func1():
    print("starting func1")
    image = getImage()
    await image
    print(image.image_sim)
    print('done func 1')


asyncio.run(main(), debug=True)

Answer 1

您可以在 getImage 中使用 async classmethod。 classmethod 可以执行设置 image_sim 属性之前所需的 0.5 秒延迟：

import asyncio
class getImage(object):
   def __init__(self, img):
      self.image_sim = img
   @classmethod
   async def get_image(cls):
      await asyncio.sleep(0.5) #sleep for 0.5 seconds
      return cls('image') #return instance of getImage with image_sim set to "image"

async def main():
   print('starting main loop')
   func1 = asyncio.create_task(my_func1())
   print("Waiting for func1 to complete") 
   await func1
   print('finished main loop')

async def my_func1():
   print("starting func1")
   image = await getImage.get_image() #await the async classmethod of getImage(object)
   print(image.image_sim)
   print('done func 1')

asyncio.run(main(), debug=True)

使用类和 Python asyncio 的正确方法

Correct way of using classes with Python asyncio

python

python-asyncio

使用 类 和 Python asyncio 的正确方法

Correct way of using classes with Python asyncio

python

python-asyncio

使用类和 Python asyncio 的正确方法