多处理-ChicklingError：can can can pickle＆lt; class＆＃x27; botocore.client.s3＆＃x27;＆gt;＆gt;＆gt;：属性查找botocore.client on botocore.client失败

Question

以下代码获取错误

_pickle.picklingerror：不能泡菜＆lt; class'botocore.client.s3'＆gt;：botocore on botocore.client.client失败

import boto3
import concurrent.futures as cf

class Boto3:
    def __init__(self) -> None:
        self.s3client = boto3.client("s3")

class C:
    def __init__(self, s3) -> None:
        self.s3 = s3  # this instance variable may have caused the problem
        
    def f(self, a):
        x = self.s3
        return a*a

c = C(Boto3())

p = [1,2,3]

def run(f, p):
    executor = cf.ProcessPoolExecutor(max_workers=3)
    result = executor.map(f, p)
    print([x for x in result])

if __name__ == "__main__":
    run(c.f, p)

是解决问题的方法吗？

---

但是，使用全局变量和函数有效吗？

s3 = boto3.client("s3")

def g(a):
    x = s3

....
    result = executor.map(g, p)

---

另外，如果s3client是类变量，则可以工作。

class Boto3:
    s3client = boto3.client("s3")