save_s3.py

headers = {
    'Cache-Control':'max-age=604800', # 60 x 60 x 24 x 7 = 1 week
    'Content-Type':content_type,
  }

  k = Key(self.get_bucket())
  k.key = filename
  k.set_contents_from_string(contents.getvalue(), headers)
  if self.public: k.make_public()
  
  for key in bucket.list():
  print key.name.encode('utf-8')
  metadata = key.metadata
  metadata['Cache-Control'] = 'max-age=604800' # 60 x 60 x 24 x 7 = 1 week
  key.copy(AWS_BUCKET, key, metadata=metadata, preserve_acl=True)
  
##############################""""
import boto3
from django.conf import settings
s3 = boto3.resource('s3')
s3client = boto3.client('s3')

# List keys
bucket = s3.Bucket(settings.AWS_STORAGE_BUCKET_NAME)
keys = [b.key for b in bucket.objects.filter(Prefix='media/blog/pictures/')]

# Get metadata for one key
s3client.head_object(Bucket=bucket.name, Key=keys[0])