docs: def get_file(path, s3_bucket=None):
      """Gets a file"""
  
      bucket_name = s3_bucket or oz.settings["s3_bucket"]
  
      if bucket_name:
          bucket = get_bucket(bucket_name)
          key = bucket.get_key(path)
          if not key:
              key = bucket.new_key(path)
          return S3File(key)
      else:
          return LocalFile(oz.settings["static_path"], path)