old_contents: #
  
  __version_info__ = (1, 0, 0, 'a', 1)
  __version__ = '.'.join(map(str, __version_info__))
  
  
new_contents: #
  
  __version_info__ = (1, 0, 0, 'a1')
  __version__ = '{0}.{1}.{2}{3}'.format(*__version_info__)
  
  
subject: fix version number format