text: import os
  
  from setup import basedir
  
  
  class BaseConfig(object):
      SECRET_KEY = "SO_SECURE"
      DEBUG = True
      SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
      SQLALCHEMY_TRACK_MODIFICATIONS = True
  
  
  class TestingConfig(object):
      """Development configuration."""
      TESTING = True
      DEBUG = True
      WTF_CSRF_ENABLED = False
      SQLALCHEMY_DATABASE_URI = 'sqlite:///:memory:'
      DEBUG_TB_ENABLED = True
      PRESERVE_CONTEXT_ON_EXCEPTION = False
  
  class CrawlerConfig(object):
      """Crawler instances properties"""
      DEPTH = 4
      FANOUT = 5
  