在终端上演示《传送门》片尾曲效果的 Python 脚本程序。
still_alive_credit.py 脚本使用 Python 3，以下提到的 pip 多数情况下对应 pip3 命令
以调用 Python 3 的 pip 组件。
Windows 下需要使用 Windows terminal，MinTTY 等支持 ANSI 终端转义序列的终端模拟器。
为了播放音乐，需要用 pip 安装 playsound。playground 在 Linux 下依赖
python-gobject 软件包（Ubuntu 已默认安装）。在 MacOS 下还需要用 pip 安装 PyObjC。
在当前目录下执行：
python3 still_alive_credit.py
脚本会读取 TERM，COLUMNS 和 LINES 环境变量来调整输出区域大小并决定是否启用终端颜色等
特性。如果希望在一台标准 VT100 终端上演示，应该运行：
TERM=vt100 python3 still_alive_credit.py
可以使用 --no-sound 参数不带音乐进行演示，此时脚本只依赖 Python 标准库：
python3 still_alive_credit.py --no-sound
A demo of the credit song 'Still Alive' of Portal 1 written in Python, running in text terminal.
still_alive_credit.py is written with Python 3. In most cases the following
pip should be pip3 command.
In Windows system, you need a teminal emulator supporting ANSI escape sequences like Windows Terminal, MinTTY, Cmder or ConEmu。
For playing music, you need install playsound with pip. In Linux playsound
depends on python-gobject (default installed in Ubuntu). In MacOS you also need
to use pip to install PyObjC.
In current directory, execute:
python3 still_alive_credit.py
The script will read environment variable TERM, COLUMNS and LINES to determine
the output area size and whether to enable features such as terminal color. If you
want run it on a standard VT100 terminal, you should execute:
TERM=vt100 python3 still_alive_credit.py
It's able to use --no-sound option to run the script without playing sound. In this
case, the script only depends on Python standard library:
python3 still_alive_credit.py --no-sound
