new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from __future__ import (absolute_import, division,
                          print_function, unicode_literals)
  
  __author__ = "Yuji Ikeda"
  
  import time
  
  
  class TimeMeasurer(object):
      """Measure method execution time.
  
      This class is made based on the suggestion in the following reference.
      http://preshing.com/20110924/timing-your-code-using-pythons-with-statement/
      """
      def __init__(self, time_string):
          self._time_string = time_string
  
      def __enter__(self):
          self._start = time.time()
          return self
  
      def __exit__(self, *args):
          time_string = self._time_string
  
          self._finish = time.time()
          interval = self._finish - self._start
  
          print('{:20s} (sec.):  {:12.4f}'.format(time_string, interval))
  
subject: Add the module to measure computational times