当在类中使用ProcessPoolExecutor时，无法pickle协程对象

import asyncio
from concurrent.futures import ProcessPoolExecutor

async def my_coroutine(arg1, arg2):
    # 协程对象的执行逻辑
    await asyncio.sleep(1)
    return arg1 + arg2

def my_function(arg1, arg2):
    # 将协程对象转换为普通函数
    loop = asyncio.get_event_loop()
    result = loop.run_until_complete(my_coroutine(arg1, arg2))
    return result

class MyClass:
    def my_method(self, arg1, arg2):
        # 将协程对象转换为类的方法
        loop = asyncio.get_event_loop()
        result = loop.run_until_complete(my_coroutine(arg1, arg2))
        return result

# 使用ProcessPoolExecutor执行函数
with ProcessPoolExecutor() as executor:
    result = executor.submit(my_function, 1, 2)
    print(result.result())  # 输出：3

# 使用ProcessPoolExecutor执行类的方法
obj = MyClass()
with ProcessPoolExecutor() as executor:
    result = executor.submit(obj.my_method, 3, 4)
    print(result.result())  # 输出：7