1. for x in [Iterable] 中的x 作用域

2. 作用域，待补充

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1. for x in [Iterable] 中的x 作用域

今天科大讯飞笔试题：
第二题怎么debug都有点问题。
然后发现是for循环的target list 只要不为空，里面的x被赋值，和函数bonus的形参x冲突。
因为for循环没有作用域(scope)。

        def bonus(m,x,k,p):
            # print m,x,k,p
            error = 0
            right = 0
            for x in p:
                if x == 1:
                    right += 1
                else:
                    error += 1

        def bonus(m,x,k,p):
            # print m,x,k,p
            error = 0
            right = 0
            for _i in p:
                if _i == 1:
                    right += 1
                else:
                    error += 1

参考：https://docs.python.org/2.7/reference/compound_stmts.html#the-for-statement
loop循环后target list不删除；但是如果sequence是空则整个循环不会赋值。

The target list is not deleted when the loop is finished, but if the sequence is empty, it will not have been assigned to at all by the loop.