s3-pickle-import.py

import pickle
import boto3
import boto3.session

cred = boto3.Session().get_credentials()
ACCESS_KEY = cred.access_key
SECRET_KEY = cred.secret_key
SESSION_TOKEN = cred.token  ## optional

s3client = boto3.client('s3', 
                        aws_access_key_id = ACCESS_KEY, 
                        aws_secret_access_key = SECRET_KEY, 
                        aws_session_token = SESSION_TOKEN
                       )

response = s3client.get_object(Bucket='name_of_your_bucket', Key='path/to_your/file.pkl')

body = response['Body'].read()
data = pickle.loads(body)