python - s3.Object() 抛出 TypeError : sequence item 0: expected str instance, tuple found

Question

按照 boto3 文档，我尝试这样做:

session = boto3.Session(
aws_access_key_id=KEY,
aws_secret_access_key=SECRET_KEY
)
s3 = session.resource('s3')

obj = s3.Object('test', 'test/myfile.csv')

当我运行 obj.get() 时，我收到:

TypeError: sequence item 0: expected str instance, tuple found

我需要获取这个 csv 文件的内容。

当我尝试使用客户端而不是 session 时，它会起作用:

s3 = boto3.client('s3')
obj = s3.get_object(Bucket='test', Key='test/myfile.csv')

Answer 1

此问题适用于 AWS S3 存储桶和 DigitalOcean Spaces 存储桶。

要复制错误:

import boto3

KEY = '********************',
SECRET_KEY = '*******************************************'

# Initialize a session using DigitalOcean Spaces.
session = boto3.session.Session()

client = session.client('s3', region_name='sgp1',
                        endpoint_url='https://sgp1.digitaloceanspaces.com',
                        aws_access_key_id=KEY,
                        aws_secret_access_key=SECRET_KEY)

抛出错误:

~/.pyenv/versions/3.8.0/lib/python3.8/site-packages/botocore/auth.py in scope(self, request)
    322         scope.append(self._service_name)
    323         scope.append('aws4_request')
--> 324         return '/'.join(scope)
    325 
    326     def credential_scope(self, request):

TypeError: sequence item 0: expected str instance, tuple found

看起来 API 有问题，但如果我们仔细观察，

>>>print(type(SECRET_KEY))
str

>>> print(type(KEY))
tuple

正如 michael-sqlbot 所评论的，有一个 tuple键入其中一个身份验证 key 。

注意上面代码中的逗号:

import boto3

KEY = '********************',

只需通过删除逗号将其更改为字符串类型:

import boto3

KEY = '********************',
SECRET_KEY = '*******************************************'

# Initialize a session using DigitalOcean Spaces.
session = boto3.session.Session()

client = session.client('s3', region_name='sgp1',
                        endpoint_url='https://sgp1.digitaloceanspaces.com',
                        aws_access_key_id=KEY,
                        aws_secret_access_key=SECRET_KEY)

[出去]:

{'ResponseMetadata': {'RequestId': '*************',
  'HostId': '',
  'HTTPStatusCode': 200,
  'HTTPHeaders': {'transfer-encoding': 'chunked',
   'x-amz-request-id': '*************',
   'content-type': 'application/xml',
   'date': 'Mon, 15 Jun 2020 01:14:42 GMT',
   'strict-transport-security': 'max-age=15552000; includeSubDomains; preload'},
  'RetryAttempts': 0},
 'Buckets': [{'Name': '*****',
   'CreationDate': datetime.datetime(2019, 11, 20, 8, 28, 36, 548000, tzinfo=tzutc())}],
 'Owner': {'DisplayName': '*******', 'ID': '********'}}