docs: def rm(self, container_alias):
  
          '''
              a method to remove an active container
              
          :param container_alias: string with name or id of container 
          :return: string with container id
          '''
  
          title = '%s.rm' % self.__class__.__name__
  
      # validate inputs
          input_fields = {
              'container_alias': container_alias
          }
          for key, value in input_fields.items():
              object_title = '%s(%s=%s)' % (title, key, str(value))
              self.fields.validate(value, '.%s' % key, object_title)
  
      # run remove command
          sys_cmd = 'docker rm -f %s' % container_alias
          output_lines = self.command(sys_cmd).split('\n')
  
          return output_lines[0]