python 排序序列融合heapq.merge

import heapq
a = [1, 4, 7, 10]
b = [2, 5, 6, 11]
for c in heapq.merge(a, b):
... print(c)
...
1
2
4
5
6
7
10
11

传入的序列，必须是排序过的

with open('sorted_file_1', 'rt') as file1,
open('sorted_file_2', 'rt') as file2,
open('merged_file', 'wt') as outf:

for line in heapq.merge(file1, file2):
    outf.write(line)