代码：

#! /usr/bin/env python
#coding=utf-8

import random

def shell_sort_pass(lst,left,delta):
    for i in range(left+delta,len(lst),delta):
        pivot = lst[i]
        while (i > left and lst[i-delta] > pivot):
            lst[i] = lst[i-delta]
            i = i - delta
        lst[i] = pivot
    
def shell_sort(lst):
    sublist_cnt = len(lst) >> 1
    while sublist_cnt > 0:
        for i in range(sublist_cnt):
            shell_sort_pass(lst,i,sublist_cnt)
        sublist_cnt = sublist_cnt >> 1
    
if  __name__ == '__main__':
    lst = [random.randint(0,20) for i in range(10)]
    lst2 = lst[:]
    lst2.sort()
    print(lst)
    print(lst2)
    shell_sort(lst)
    print(lst)
    

>>>

[6, 17, 20, 14, 6, 7, 18, 7, 18, 3]
[3, 6, 6, 7, 7, 14, 17, 18, 18, 20]
[3, 6, 6, 7, 7, 14, 17, 18, 18, 20]