摘要：
def f(x): print 'original' if x > 0: return f(x-1) return 0g = fdef f(x): print 'new' return xprint g(5)结果是:originalnew4证明了:1.when g(5) runs, origninal `f`is called,not new `f`.2.as 5>0,'return f(x-1)'is executed3.new`f`is called when `f(x-1)` runs. so the result is 4. 阅读全文
