linux下python SDK的分片上传有403 BUG，麻烦修复下

环境ubuntu 64位， python3.4.3
普通断点上传正常，分片上传403错误

测试代码
auth = oss2.Auth('我的id', '我的key')
        bucket = oss2.Bucket(auth,'oss-cn-beijing.aliyuncs.com', 'dtap')
        try:
#简单断点上传，上传成功

            oss2.resumable_upload(bucket, '16050415580881917', '/root/桌面/16050415580881917.gif')   #没有问题上传成功
#分片上传1，403错误

            oss2.resumable_upload(bucket, '16050415580881917', '/root/桌面/16050415580881917.gif', multipart_threshold=100 * 1024) #上传失败
#分片上传2,403错误

            total_size = os.path.getsize('/root/桌面/16050415580881917.gif')
            part_size = oss2.determine_part_size(total_size, preferred_size=128 * 1024)
            upload_id = bucket.init_multipart_upload('16050415580881917').upload_id
            with open('/root/桌面/16050415580881917.gif', 'rb') as fileobj:
                parts = []
                part_number = 1
                offset = 0
                while offset < total_size:
                    num_to_upload = min(part_size, total_size - offset)
                    result = bucket.upload_part('16050415580881917', upload_id, part_number,
                                                oss2.SizedFileAdapter(fileobj, num_to_upload))
                    parts.append(oss2.models.PartInfo(part_number, result.etag))
                    offset += num_to_upload
                    part_number += 1
                bucket.complete_multipart_upload('16050415580881917', upload_id, parts)
        except Exception as e:
            print(e)
            time.sleep(10)
错误消息统一为
{'details': {'Code': 'SignatureDoesNotMatch', 'StringToSign': 'POST\n\napplication/x-www-form-urlencoded\nFri, 23 Dec 2016 09:41:50 GMT\n/dtap/16050415580881916?uploadId=0116367504714646848EC982E26AC317', 'OSSAccessKeyId': 'LTAI6L8wYzFhiR3R', 'StringToSignBytes': '50 4F 53 54 0A 0A 61 70 70 6C 69 63 61 74 69 6F 6E 2F 78 2D 77 77 77 2D 66 6F 72 6D 2D 75 72 6C 65 6E 63 6F 64 65 64 0A 46 72 69 2C 20 32 33 20 44 65 63 20 32 30 31 36 20 30 39 3A 34 31 3A 35 30 20 47 4D 54 0A 2F 64 74 61 70 2F 31 36 30 35 30 34 31 35 35 38 30 38 38 31 39 31 36 3F 75 70 6C 6F 61 64 49 64 3D 30 31 31 36 33 36 37 35 30 34 37 31 34 36 34 36 38 34 38 45 43 39 38 32 45 32 36 41 43 33 31 37 ', 'Message': 'The request signature we calculated does not match the signature you provided. Check your key and signing method.', 'SignatureProvided': 'j3r6XyQ2e2BVOHzbtGAxKhWzw5Q=', 'RequestId': '585CF15D1B658DF847091A69', 'HostId': 'dtap.oss-cn-beijing.aliyuncs.com'}, 'status': 403}

另外有一点值得注意，似乎是在上传过程中出现异常，我在分片上传2循环中打断点，手动控制它不执行那么快，有时候是可以上传成功的，这似乎是个BUG？麻烦看下，不用分片上传的话速度太慢