text: base_url = 'https://api.nytimes.com/svc/books/v3/lists/best-sellers/history.json'
  api_key_name = 'api-key'
  # offsets
  initial_offset = 0
  op_offset = 20
  # api limits
  max_req_per_minute = 10
  max_req_per_day = 4000
  req_sleep = 60 / max_req_per_minute
  