Boto region_name丢失

Question

我尝试了各种方法来建立与S3兼容的服务的连接，但我一直收到错误。下面的代码抛出下面的错误。有什么想法吗？

import os 
import boto
import boto.s3.connection
from boto.s3.key import Key

try:

    conn = boto.s3.connect_to_region(region = 'nil',
    aws_access_key_id = 'xx',
    aws_secret_access_key = 'xx',
    host = 'ds41s3-scs.xx.com',
    calling_format = boto.s3.connection.OrdinaryCallingFormat(),
    )

    response = s3.list_buckets()

except Exception,e:
    print str(e)
    print "error"

错误：

TypeError: connect_to_region() missing 1 required positional argument: 'region_name'