用Python实现自底向上的归并排序，输出是原排序，检查不出错误，求解

 def merge(left,right):
    #合并数组
    i,j=0,0
    result=[]
    while i<len(left) and j<len(right):
        if left[i]<=right[j]:
            result.append(left[i])
            i+=1
        else:
            result.append(right[j])
            j+=1
    result+=left[i:]
    result+=right[j:]
    return result

def merge_sort(lists):
    count=len(lists)
    #result=[]
    sz=1
    while sz<=count//2:
        i=0
        while i<count-sz:
            result[i:i+sz*2]=merge(lists[i:i+sz],lists[i+sz:i+sz*2])
            i+=sz*2
        sz*=2
    return result

http://blog.csdn.net/liujianfeng1984/article/details/47204367