# -*- coding:utf-8 -*-
"""
作者：sunli
日期：2022年01月05日
"""
# coding:utf-8
readDir = "D1.txt"
writeDir = "D2.txt"
outfile = open(writeDir, "w")
f = open(readDir, "r")
lines_seen = set() # Build an unordered collection of unique elements.
for line in f:
line = line.strip('\n')
if line not in lines_seen:
outfile.write(line + '\n')
lines_seen.add(line)
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