code: def unregister_module(self, module):
          
  
          if module not in self._modules:
              raise NoRegisteredError("Module '{0}' is not registered on loader.".format(module))
  
          self._modules.remove(module)
docs: Unregister a module.
  
          :param module: must be a string or a module object to unregistered
          :type module: str