tetris with python+pygame

单文件，代码都在main.py里，打开即可。

几年前的初学产物，有大量绿皮代码，尽请谅解。

WARNING: BROKEN ENGLSH BELOW

Only one file, the source code is in the file ./main.py.

Programmed few years ago when I was a newcomer. So there are many strange code in this program.