code: def get_setting_with_envfallback(setting, default=None, typecast=None):
      
      try:
          from django.conf import settings
      except ImportError:
          return default
      else:
          fallback = getattr(settings, setting, default)
          value = os.environ.get(setting, fallback)
          if typecast:
              value = typecast(value)
          return value
docs: Get the given setting and fall back to the default of not found in
      ``django.conf.settings`` or ``os.environ``.
  
      :param settings: The setting as a string.
      :param default: The fallback if ``setting`` is not found.
      :param typecast:
          A function that converts the given value from string to another type.
          E.g.: Use ``typecast=int`` to convert the value to int before returning.