Today, I've referred to the "cute python: iterator and simple generator" on IBM:
Http://www-900.ibm.com/developerWorks/cn/linux/sdk/python/charm-20/index.shtml
Remove the OpenUSS 'ussc.py, the effect is good, it can be better abstract problems.
About Yeild's usage, I started a little doubtful, look at Manual 6.8
Yield_Stmt :: = "yield" expression_list
The following is Expression_List !!!!!!!!!!!
This is equivalent to the function return value.
