text: ## -*- coding: utf-8 -*-
  ## Copyright (c) 2015-2020, Exa Analytics Development Team
  ## Distributed under the terms of the Apache License 2.0
  #"""
  #PW Input Composer
  ###########################
  #
  #"""
  #from exa import TypedProperty
  #from exatomic.qe.base_composer import PWCPComposer
  #
  #
  #class PWInput(PWCPComposer):
  #    """
  #    Input file composer for Quantum ESPRESSO's pw.x module.
  #    """
  #    control = TypedProperty(dict)
  #    system = TypedProperty(dict)
  #    electrons = TypedProperty(dict)
  #    ions = TypedProperty(dict)
  #    cell = TypedProperty(dict)
  