Python / S3 - Functions to list keys in an S3 bucket using Python

Reference : https://alexwlchan.net/2017/07/listing-s3-keys/

from glob import glob
import boto3


class Versions:
    def __init__(self):
        """Gets the latest version from local or s3"""        

         pass

    def get_latest_version_from_local(path):
        """Gets the latest version from Local"""        

        versions_paths = glob((path + "/*"), recursive=True)
        versions = []
        for i in enumerate(versions_paths):
            split_path = i[1].rstrip('/').split("/")
            version = split_path.pop()
            versions.append(version)
        versions.sort(reverse=True)
        return versions[0]

    def get_latest_version_from_s3(bucket_name, path):
        """Gets the latest version from s3 """       

        key = path.rstrip('/').split("/").pop()
        s3 = boto3.client('s3')
        response = s3.list_objects_v2(
            Bucket=bucket_name,            

            Prefix=key,            

            MaxKeys=100)
        versions = []
        for obj in response['Contents']:
            split_path = obj['Key'].rstrip('/').split("/")
            versions.append(split_path[1])
        versions.sort(reverse=True)
        return versions[0]
 

    def get_all_s3_keys(bucket_name):
        """Get a list of all keys in an S3 bucket."""        

        versions = []

        kwargs = {'Bucket': bucket_name}
        s3 = boto3.client('s3')
        while True:
            resp = s3.list_objects_v2(**kwargs)
            for obj in resp['Contents']:
                if 'well_production' in str(obj['Key']) 

                    and '$folder$' not in str(obj['Key']):
                    versions.append(obj['Key'])
            try:
                kwargs['ContinuationToken'] = resp['NextContinuationToken']
            except KeyError:
                break        

        versions.sort(reverse=True)
        return versions[0]