Using paginator

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import boto3

s3 = boto3.client('s3')

paginator = s3.get_paginator('list_objects_v2')
pages = paginator.paginate(Bucket='my-bucket')

for page in pages:
    for object in page['Contents']:
        print(object['Key'])

Using collections

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import boto3

s3 = boto3.resource('s3')
bucket = s3.Bucket('my-buycket')
objects = bucket.objects.all()

for object in objects:
    print(object.key)