new_contents: # -*- coding: utf-8 -*-
  """This is not part of the test suite.
  """
  from hashlib import md5, sha1, sha256
  from time import time
  
  
  num = 1000000
  print('running {} key generation comparison'.format(num))
  
  # md5
  pt = time()
  for i in range(num):
      key = b'myval-%d' % i
      int(md5(b'%s' % key).hexdigest(), 16)
  print('md5 took {} s'.format(time() - pt))
  
  # sha1
  pt = time()
  for i in range(num):
      key = b'myval-%d' % i
      int(sha1(b'%s' % key).hexdigest(), 16)
  print('sha1 took {} s'.format(time() - pt))
  
  # sha256
  pt = time()
  for i in range(num):
      key = b'myval-%d' % i
      int(sha256(b'%s' % key).hexdigest(), 16)
  print('sha256 took {} s'.format(time() - pt))
  
  # CityHash
  try:
      from cityhash import CityHash32, CityHash64, CityHash128
  except ImportError:
      print('CityHash not installed, pip install cityhash')
  else:
      # cityhash32
      pt = time()
      for i in range(num):
          key = b'myval-%d' % i
          CityHash32(b'%s' % key)
      print('CityHash32 took {} s'.format(time() - pt))
  
      # cityhash64
      pt = time()
      for i in range(num):
          key = b'myval-%d' % i
          CityHash64(b'%s' % key)
      print('CityHash64 took {} s'.format(time() - pt))
  
      # cityhash128
      pt = time()
      for i in range(num):
          key = b'myval-%d' % i
          CityHash128(b'%s' % key)
      print('CityHash128 took {} s'.format(time() - pt))
  
  # murmurhash v3
  try:
      import mmh3
  except ImportError:
      print('MurmurHash v3 not installed, pip install murmurhash3')
  else:
      pt = time()
      for i in range(num):
          key = b'myval-%d' % i
          mmh3.hash(b'%s' % key)
      print('MurmurHash v3 took {} s'.format(time() - pt))
  
subject: add hashes simple benchmarking code