code: def fix_chrome_mac_platform(platform):
      
      ver = platform.split('OS X ')[1]
      build_range = range(*MACOSX_CHROME_BUILD_RANGE[ver])
      build = choice(build_range)
      mac_ver = ver.replace('.', '_') + '_' + str(build)
      return 'Macintosh; Intel Mac OS X %s' % mac_ver
docs: Chrome on Mac OS adds minor version number and uses underscores instead
      of dots. E.g. platform for Firefox will be: 'Intel Mac OS X 10.11'
      but for Chrome it will be 'Intel Mac OS X 10_11_6'.
  
      :param platform: - string like "Macintosh; Intel Mac OS X 10.8"
      :return: platform with version number including minor number and formatted
      with underscores, e.g. "Macintosh; Intel Mac OS X 10_8_2"