python如何删除文件中重复的字段

本文实例为大家分享了python如何删除文件中重复字段的具体代码，供大家参考，具体内容如下

原文件内容放在list中，新文件内容按行查找，如果没有出现在list中则写入第三个文件中。

import csv

filetxt1 = 'E:/gg/log/log1.txt'
filecsv1 = 'E:/gg/log/log1.csv'
filecsv2 = 'E:/gg/log/log2.csv'
filecsv3 = 'E:/gg/log/log3.csv'

class operFileCsv():
def __init__(self, filename=None):
 self.filename = filename

def readCsvFile(self):
 readCsvHandler = open(self.filename, 'r')
 filelines = csv.reader(readCsvHandler, dialect='excel')
 for fileline in filelines:
  print(fileline)
 readCsvHandler.close

def writeCsvFile(self, writeline):
 writeCsvHandler = open(self.filename, 'a', newline='')
 csvWrite = csv.writer(writeCsvHandler, dialect='excel', )
 csvWrite.writerow(writeline)
 writeCsvHandler.close()

class getLogBuffFromFile():
def __init__(self):
 self.logBuff1 = []

def getLog1Buff(self, filename):
 with open(filename) as filehandler:
  while True:
   logOneLine = filehandler.readline().strip()
   if not logOneLine:
    break
   self.logBuff1.append(logOneLine)
 # print('TRACE: The log1 has ', len(self.logBuff1), ' lines.')
 return self.logBuff1

def getLog2Buff(self, logOneLine):
 pass

class deleteIterantLog():
def __init__(self):
 self.logBuff1List = None
 self.logBuff2OneLine = None

def deleteProcedure(self, oldlog, newlog, createlog):
 self.logBuff1List = getLogBuffFromFile().getLog1Buff(oldlog)
 self.dealProcedure(newlog, createlog)

def dealProcedure(self, file1name, file2name):
 with open(file1name, 'r') as readCsvHandler:
  filelines = csv.reader(readCsvHandler, dialect='excel')
  for fileline in filelines:
   if fileline[1] not in self.logBuff1List:
    operFileCsv(file2name).writeCsvFile(fileline)

if __name__ == '__main__':
deleteIterantLog().deleteProcedure(filetxt1, filecsv2, filecsv3)

小编再为大家分享一段Python用集合把文本中重复的字去掉的方法：

import os,sys,datetime
import codecs
with open('aaaaa.txt', 'r') as f:  #读入文本中的文件
l = f.readlines() # txt中所有字符串读入data
x=set(l[0])
for i in range(1,len(l)):
 x.update(l[i])
s="".join(list(x))
print(s)
with open('result.txt','wb') as f1: #把结果写到文件result中
b=bytes(s,encoding="utf-8")
f1.write(b)

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来源：https://blog.csdn.net/duanyl123/article/details/83043489