old_contents: import os
  
  
  DEBUG = bool(int(os.environ['DEBUG']))  # value '0' or '1'
  APP_NAME = 'library'
  
  ROUTES = [
      ('/', 'controllers.hello.Hello'),
      ('/test', 'controllers.test.Test'),
  ]
  
new_contents: import os
  
  DEBUG = bool(os.getenv('DEBUG', 0))  # default false
  APP_NAME = 'library'
  
  ROUTES = [
      ('/', 'controllers.hello.Hello'),
      ('/test', 'controllers.test.Test'),
  ]
  
subject: fix determining DEBUG from environment variable