Python做文本按行去重的实现方法

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line_dict_uniq = dict()
with open('1.txt','r') as fd:
for line in fd:
key = line.split(' ')[0]
if key not in line_dict_uniq.values():
line_dict_uniq[key] = line
else:
continue
print line_dict_uniq 
print len(line_dict_uniq)
# 这里是打印了不重复的行（重复的只打印一次），实际再把这个结果写入文件就可以了，
# 就不写这段写入文件的代码了


上面这个程序执行效率比较低，改成如下会提高一些:


line_dict_uniq = dict()
with open('1.txt','r') as fd:
for line in fd:
key = line.split(' ')[0]
if key not in line_dict_uniq.keys():
line_dict_uniq[key] = line
else:
continue
print line_dict_uniq
print len(line_dict_uniq)


继续补充一个函数


# -*- coding: utf-8 -*-
'''
只使用与较小的文件，比较大的文件运行时间长
'''
def quchong(infile,outfile):

  infopen = open(infile,'r',encoding='utf-8')
  outopen = open(outfile,'w',encoding='utf-8')
  lines = infopen.readlines()
  list_1 = []
  for line in lines:
    if line not in list_1:
      list_1.append(line)
      outopen.write(line)
  infopen.close()
  outopen.close()
quchong("源文件路径","目标文件路径")


以上所述是小编给大家介绍的Python做文本按行去重，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！