剑指offer63-数据流中的中位数**

# -*- coding:utf-8 -*-
class Solution:
    def __init__(self):
        self.stream=[]
    def Insert(self, num):
        # write code here
        self.stream.append(num)
    def GetMedian(self,streaming):
        # write code here
        streaming=sorted(self.stream)
        lenth=len(streaming)
        if lenth%2==0:
            return (streaming[lenth/2-1]+streaming[lenth/2])/2.0          #注意这里是python2编辑的，默认不除尽，所以要写成2.0保留小数
        else:
            return streaming[lenth//2]