AWS Lambda中的Boto3 S3列表对象抛出错误

Question

Code in lambda:

import boto3

def lambda_handler(event, context):
    s3_client = boto3.resource('s3')
    mybucket = s3_client.Bucket('bucket-name')
    for object in mybucket.objects.all():
       print(object)

    for key in s3_client.list_objects(Bucket='bucket-name')['Contents']:
       print(key['Key'])'

the first 'for' block list all the keys in the bucket but the second 'for' block throws following error.

's3.Service Resource' object has no attribute 'list_objects' : AttributeError

It doesn't make sense based on http://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Client.list_buckets . any hint on what could be the problem? i used python 2.7 as well as python 3.6

Answer 1

A boto3 service resource is not the same as the older boto library's service client. You are apparently mixing the documentation of the two.

A client is low level client, and just wraps the AWS APIs to python basic datatypes. All services have a client available in boto3.

Do check the documentation for a Resource and a Client .

Resources

Resources represent an object-oriented interface to Amazon Web Services (AWS). They provide a higher-level abstraction than the raw, low-level calls made by service clients.

 resource = boto3.resource('s3') 

Clients

Clients provide a low-level interface to AWS whose methods map close to 1:1 with service APIs. All service operations are supported by clients. Clients are generated from a JSON service definition file.

 client = boto3.client('s3')