Boto3 对象读取类型错误：预期字符串或类似字节的对象

Question

我正在尝试读取上传到 Amazon s3 存储桶的 .txt 文件中的文本。但我收到错误。

import boto3
import json

s3= boto3.resource('s3')
bucketList=[]
i=1
for bucket in s3.buckets.all():
           print(str(i)+'.' + bucket.name)
           bucketList.append(bucket)
           i=i+1
BucketSel=int(input('Select from the bucket list using number'))
AccessBucket=bucketList[BucketSel-1]
FileList=[]
for obj in AccessBucket.objects.all():
           print(obj.key)
           FileList.append(obj.key)
FileSel=int(input('Select the File from the List using number'))
AccessFile=FileList[FileSel-1]
obj=s3.Object(AccessBucket, AccessFile)
str=obj.get()['Body'].read()

我收到以下错误。

Traceback (most recent call last):
  File "G:\pyworkspace\BucketSelectFromList.py", line 20, in <module>
    str=obj.get()['Body'].read()
  File "C:\Program Files\Python37\lib\site-packages\boto3\resources\factory.py", line 520, in do_action
    response = action(self, *args, **kwargs)
  File "C:\Program Files\Python37\lib\site-packages\boto3\resources\action.py", line 83, in __call__
    response = getattr(parent.meta.client, operation_name)(**params)
  File "C:\Program Files\Python37\lib\site-packages\botocore\client.py", line 314, in _api_call
    return self._make_api_call(operation_name, kwargs)
  File "C:\Program Files\Python37\lib\site-packages\botocore\client.py", line 586, in _make_api_call
    api_params, operation_model, context=request_context)
  File "C:\Program Files\Python37\lib\site-packages\botocore\client.py", line 619, in _convert_to_request_dict
    api_params, operation_model, context)
  File "C:\Program Files\Python37\lib\site-packages\botocore\client.py", line 648, in _emit_api_params
    params=api_params, model=operation_model, context=context)
  File "C:\Program Files\Python37\lib\site-packages\botocore\hooks.py", line 227, in emit
    return self._emit(event_name, kwargs)
  File "C:\Program Files\Python37\lib\site-packages\botocore\hooks.py", line 210, in _emit
    response = handler(**kwargs)
  File "C:\Program Files\Python37\lib\site-packages\botocore\handlers.py", line 217, in validate_bucket_name
    if VALID_BUCKET.search(bucket) is None:
TypeError: expected string or bytes-like object

我知道错误发生在 read() 处，但我不确定如何纠正此错误。

---

解决了

我用obj=s3.Object(AccessBucket.name, AccessFile)的是它并且obj=s3.Object(AccessBucket, AccessFile)它有效。

Answer 1

当存储桶名称配置不正确时，我遇到了类似的问题。

Answer 2

从get() 文档中，.get()返回一个StreamingBody. 这是一系列字节，而不是字符串。

从使用 Boto3 以字符串形式打开 S3 对象，您可以使用：

import boto3

s3 = boto3.resource('s3')

obj = s3.Object(bucket, key)
obj.get()['Body'].read().decode('utf-8') 

如果失败，那么我建议您将该对象下载到本地文件系统，然后使用标准 Python 命令读取该文件。