new_contents: """Change version."""
  import fileinput
  import sys
  
  VERSION = sys.argv[1]
  
  for line in fileinput.input('../PKGBUILD', inplace=True):
      if 'pkgver=' in line:
          line = 'pkgver=%s' % VERSION
      print line.rstrip('\n')
  
  for line in fileinput.input('../setup.py', inplace=True):
      if 'VERSION = ' in line:
          line = 'VERSION = \'%s\'' % VERSION
      print line.rstrip('\n')
  
  for file_path in ['build_arch.sh', 'vagrant_build_ubuntu.sh']:
      for line in fileinput.input(file_path, inplace=True):
          if 'VERSION=' in line:
              line = 'VERSION=\'%s\'' % VERSION
          print line.rstrip('\n')
  
subject: Add script to change version