Boto3 S3, sort bucket by last modified

Related searches

I need to fetch a list of items from S3 using Boto3, but instead of returning default sort order (descending) I want it to return it via reverse order.

I know you can do it via awscli:

aws s3api list-objects --bucket mybucketfoo --query "reverse(sort_by(Contents,&LastModified))"

and its doable via the UI console (not sure if this is done client side or server side)

I cant seem to see how to do this in Boto3.

I am currently fetching all the files, and then sorting...but that seems overkill, especially if I only care about the 10 or so most recent files.

The filter system seems to only accept the Prefix for s3, nothing else.

If there are not many objects in the bucket, you can use Python to sort it to your needs.

Define a lambda to get the last modified time:

get_last_modified = lambda obj: int(obj['LastModified'].strftime('%s'))

Get all objects and sort them by last modified time.

s3 = boto3.client('s3')
objs = s3.list_objects_v2(Bucket='my_bucket')['Contents']
[obj['Key'] for obj in sorted(objs, key=get_last_modified)]

If you want to reverse the sort:

[obj['Key'] for obj in sorted(objs, key=get_last_modified, reverse=True)]

Boto3 S3, sort bucket by last modified, Boto3 S3, sort bucket by last modified. 0 votes. I need to fetch a list of items from S3 using Boto3, but instead of returning default sort order� I need to fetch a list of items from S3 using Boto3, but instead of returning default sort order (descending) I want it to return it via reverse order. I know you can do it via awscli: aws s3api list-objects --bucket mybucketfoo --query "reverse(sort_by(Contents,&LastModified))"

I did a small variation of what @helloV posted below. its not 100% optimum, but it gets the job done with the limitations boto3 has as of this time.

s3 = boto3.resource('s3')
my_bucket = s3.Bucket('myBucket')
unsorted = []
for file in my_bucket.objects.filter():
   unsorted.append(file)

files = [obj.key for obj in sorted(unsorted, key=get_last_modified, 
    reverse=True)][0:9]

Boto3 S3, sort bucket by last modified - Python - Community, I need to fetch a list of items from S3 using Boto3, but instead of returning default sort order (descending) I want it to return it via reverse order. Bucket read operations, such as iterating through the contents of a bucket, should be done using Boto3. Object-related operations at an individual object level should be done using Boto3. Conclusion. Congratulations on making it to the end of this tutorial! You’re now equipped to start working programmatically with S3.

it seems that is no way to do the sort by using boto3. According to the documentation, boto3 only supports these methods for Collections:

all(), filter(**kwargs), page_size(**kwargs), limit(**kwargs)

Hope this help in some way. https://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.ServiceResource.buckets

python: Boto3 S3, sort bucket by last modified, I need to fetch a list of items from S3 using Boto3, but instead of returning default sort order (descending) I want it to return it via reverse order. Amazon S3 buckets¶. An Amazon S3 bucket is a storage location to hold files. S3 files are referred to as objects. This section describes how to use the AWS SDK for Python to perform common operations on S3 buckets.

keys = []

kwargs = {'Bucket': 'my_bucket'}
while True:
    resp = s3.list_objects_v2(**kwargs)
    for obj in resp['Contents']:
        keys.append(obj['Key'])

    try:
        kwargs['ContinuationToken'] = resp['NextContinuationToken']
    except KeyError:
        break

this will get you all the keys in a sorted order

Iterate Objects in S3 Buckets and Find Latest Modified Date , There's not really a very intuitive way to view file metadata via S3 web portal, so I wrote this script using Boto 3. It iterates through all objects within� Executing aws s3 ls on the entire bucket several times a day and then sorting through the list seems inefficient. Is there a way to simply request a list of objects with a modified time <, >, = a certain timestamp? Also, are we charged once for the aws s3 ls request, or once for each of the objects returned by the request?

A simpler approach, using the python3 sorted() function:

import boto3
s3 = boto3.resource('s3')

myBucket = s3.Bucket('name')

def obj_last_modified(myobj):
    return myobj.last_modified

sortedObjects = sorted(myBucket.objects.all(), key=obj_last_modified, reverse=True)

you now have a reverse sorted list, sorted by the 'last_modified' attribute of each Object.

S3 — Boto3 Docs 1.14.30 documentation, Usage: import boto3 s3 = boto3.resource('s3') copy_source = { 'Bucket': 'mybucket ', 'Key': 'mykey' } Returns the date that the object was last modified. This implementation of the DELETE operation removes default encryption from the bucket. For information about the Amazon S3 default encryption feature, see Amazon S3 Default Bucket Encryption in the Amazon Simple Storage Service Developer Guide. To use this operation, you must have permissions to perform the s3:PutEncryptionConfiguration action

A job might also be cancelled if ownership of an S3 bucket changed while the job was running, and that change affected the job's access to the bucket. COMPLETE - Amazon Macie finished processing all the data specified for the job.

The last_modified property of a s3.key.Key does not always have the same format For example: >>> import boto >>> cx = boto.connect_s3("XXXX", "XXXX") >>> bucket = cx

The managed upload methods are exposed in both the client and resource interfaces of boto3: S3.Client method to upload a file by name: S3.Client.upload_file() S3.Client method to upload a readable file-like object: S3.Client.upload_fileobj() S3.Bucket method to upload a file by name: S3.Bucket.upload_file()

Comments
  • You can get all objects, get their last modified date and sort them based on the date. Check out this question
  • The S3 api does not support listing in this way. The CLI (and probably the console) will fetch everything and then perform the sort.
  • You're getting the data back into Python, so simply sort the returned data. There's no need to ask boto3 to do it for you -- it's just one extra line of Python.
  • @JohnRotenstein the issue is complexity. why get N records, and then sort N records to get the set Z that you want, when you can ask AWS to only return Z set initially? same reason i wouldn't want to do select * from table . and then loop through and find "where X = 1".
  • You can use subprocess module to run the aws cli api that supports sort by date.
  • list_objects_v2 returns 1000 objects max, if your bucket contains more than 1000 the above won't work
  • @Tomer thats why I put the disclaimer If there are not many objects in the bucket
  • Is it needed to cast the 'LastModified' to string and then to in? This seems to work as well: get_last_modified = lambda obj: obj['LastModified']
  • @helloV but is there a reason to format the date as string in the first place? Comparing datetime objects directly seems to work.
  • Apparently using %s is frowned upon. You can use .timestamp() instead: stackoverflow.com/questions/11743019/…
  • what does [0:9] do?
  • @VikrantGoel filters it from 0 to 9, so gets a subset of the array