import errno, random, winreg

key = winreg.OpenKey(winreg.HKEY_LOCAL_MACHINE,
                     r'SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall',
                     0, winreg.KEY_READ)
steam_game_list = []
for i in range(0, winreg.QueryInfoKey(key)[0]):
    entry_key_name = winreg.EnumKey(key, i)
    entry_key = winreg.OpenKey(key, entry_key_name)
    try:
        if entry_key_name.startswith('Steam'):
            game_name = winreg.QueryValueEx(entry_key, 'DisplayName')[0]
            steam_game_list.append(game_name)
    except OSError as e:
        if e.errno == errno.ENOENT:
            # DisplayName doesn't exist in this skey
            pass
    finally:
        entry_key.Close()

print('total steam games: %s' % len(steam_game_list))
print('game to play: %s' % random.choice(steam_game_list))