difference between client and resource in boto3

+1 vote
Mar 1, 2019 in AWS by anonymous
8,270 views

1 answer to this question.

+1 vote

The main difference between Client and Resources are as follows:

Client Resource
  • low-level service access
  • generated from service description
  • exposes botocore client to the developer
  • typically maps 1:1 with the service API
  • higher-level, object-oriented API
  • generated from resource description
  • uses identifiers and attributes
  • has actions (operations on resources)
  • exposes subresources and collections

answered Mar 1, 2019 by Priyaj
• 58,080 points
Please give some examples to understand the difference better.

Here's an example of using boto client-level access to an s3 bucket:

import boto3

    client = boto3.client('s3')
    response = client.list_objects(Bucket='example')
    for content in response['cont']:
        obj_dict = client.get_object(Bucket='example', Key=cont['Key'])
        print(cont['Key'], obj_dict['LastModified'])

an example of using boto resource-level access to an s3 bucket:

import boto3

    s3 = boto3.resource('s3')
    bucket = s3.Bucket('example')
    for obj in bucket.objects.all():
        print(obj.key, obj.last_modified)

Error in copy-pasted code:

import boto3
    client = boto3.client('s3')
    response = client.list_objects(Bucket='example')
    for content in response['cont']:
        obj_dict = client.get_object(Bucket='example', Key=cont['Key'])
        print(cont['Key'], obj_dict['LastModified'])

Where is "cont" defined for Key=cont['Key'] ?

It can't be a typo for the actual working code?

It's can happen only in copy-paste code 

This is just a part of a program. You can customize your code accordingly.

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