code: def summary(args):
      
      from jcvi.graphics.histogram import loghistogram
  
      p = OptionParser(summary.__doc__)
      opts, args = p.parse_args(args)
  
      if len(args) != 1:
          sys.exit(not p.print_help())
  
      clstrfile, = args
      cf = ClstrFile(clstrfile)
      data = list(cf.iter_sizes())
      loghistogram(data, summary=True)
docs: %prog summary cdhit.clstr
  
      Parse cdhit.clstr file to get distribution of cluster sizes.