docs: def _initialize(self, settings_module):
          """
          Initialize the settings from a given settings_module
          settings_module - path to settings module
          """
          #Get the global settings values and assign them as self attributes
          self.settings_list = []
          for setting in dir(global_settings):
              #Only get upper case settings
              if setting == setting.upper():
                  setattr(self, setting, getattr(global_settings, setting))
                  self.settings_list.append(setting)
  
          #If a settings module was passed in, import it, and grab settings from it
          #Overwrite global settings with theses
          if settings_module is not None:
              self.SETTINGS_MODULE = settings_module
  
              #Try to import the settings module
              try:
                  mod = import_module(self.SETTINGS_MODULE)
              except ImportError:
                  error_message = "Could not import settings at {0}".format(self.SETTINGS_MODULE)
                  log.exception(error_message)
                  raise ImportError(error_message)
  
              #Grab uppercased settings as set them as self attrs
              for setting in dir(mod):
                  if setting == setting.upper():
                      if setting == "INSTALLED_APPS":
                          self.INSTALLED_APPS += getattr(mod, setting)
                      else:
                          setattr(self, setting, getattr(mod, setting))
                      self.settings_list.append(setting)
  
          #If PATH_SETTINGS is in the settings file, extend the system path to include it
          if hasattr(self, "PATH_SETTINGS"):
              for path in self.PATH_SETTINGS:
                  sys.path.extend(getattr(self,path))
  
          self.settings_list = list(set(self.settings_list))