docs: def about():
      """
      About box for aps. Gives version numbers for
      aps, NumPy, SciPy, Cython, and MatPlotLib.
      """
      print("")
      print("aps: APS Journals API in Python for Humans")
      print("Copyright (c) 2017 and later.")
      print("Xiao Shang")
      print("")
      print("aps Version:        %s" % aps.__version__)
      print("Numpy Version:      %s" % numpy.__version__)
      print("Scipy Version:      %s" % scipy.__version__)
      try:
          import Cython
          cython_ver = Cython.__version__
      except:
          cython_ver = 'None'
      print("Cython Version:     %s" % cython_ver)
      try:
          import matplotlib
          matplotlib_ver = matplotlib.__version__
      except:
          matplotlib_ver = 'None'
      print("Matplotlib Version: %s" % matplotlib_ver)
      print("Python Version:     %d.%d.%d" % sys.version_info[0:3])
      print("Number of CPUs:     %s" % hardware_info()['cpus'])
  #    print("BLAS Info:          %s" % _blas_info())
      print("Platform Info:      %s (%s)" % (platform.system(),
                                             platform.machine()))
      aps_install_path = os.path.dirname(inspect.getsourcefile(aps))
      print("Installation path:  %s" % aps_install_path)
      print("")