python筛选出两个文件中重复行的方法

本文实例为大家分享了python脚本筛选出两个文件中重复的行数，供大家参考，具体内容如下

'''
查找A文件中，与B文件中内容不重复的内容
'''
#!usr/bin/python

import sys
import os

'''
字符串查找函数，使用二分查找法在列表中进行查询
'''
def binarySearch(value, lines):
 right = len(lines) - 1
 left = 0
 a = value.strip()
 while left <= right:
   middle = int((right + left + 1)/2)
   b = lines[middle].strip()
   if a == b:
     return 1

if a < b:
     right = middle - 1
   else:
     left = middle + 1

return 0

DPT = 100000 # DPT 是Data Per File的意思

fileAName = sys.argv[1];
fileBName = sys.argv[2];

#STEP1：先拆掉B文件，作为比较基准，临时文件命名为temp1,temp2,...,tempN
print("拆分比对文件...\n")
fB = open(fileBName)
tempFileNo = 1
tempFileName = "temp{0}".format(tempFileNo)
fTemp = open(tempFileName, "w+")
line = fB.readline()
lineCount = 0
while line:
 if lineCount >= DPT:
   fTemp.flush()
   fTemp.close()
   tempFileNo = tempFileNo + 1
   tempFileName = "temp{0}".format(tempFileNo)
   fTemp = open(tempFileName, "w+")
   lineCount = 0
 fTemp.write(line)
 lineCount = lineCount + 1
 line = fB.readline()  

fTemp.flush()
fTemp.close()

fB.close()
print("拆分完成，一共{0}个临时文件，{1}条数据。\n".format(tempFileNo, (tempFileNo-1)*DPT + lineCount))

#STEP2：把A文件与B文件拆出来的临时文件逐个进行比较，将结果轮流写入文件result0, result1
#    最后写入的result文件就是最终结果
fA = open(fileAName)
resultTempFile = {"result0", "result1"};
tempIndex = 0
fOut = open("repeat", "w+")
repeatCount = 0
for i in range(1, tempFileNo + 1):
 print("比较第{0}个临时文件...\n".format(i))
 if 0 == tempIndex:
   resultTempFile = "result0"  
   tempIndex = 1
 else:
   resultTempFile = "result1"
   tempIndex = 0
 fResult = open(resultTempFile, "w+")

fTemp = open("temp{0}".format(i))
 lineSet = fTemp.readlines()
 fTemp.close()
 lineList = list(lineSet)
 lineList.sort()

line = fA.readline()
 while line:
   if 0 == binarySearch(line, lineList):
     fResult.write(line)
   else:
     fOut.write(line)
     repeatCount = repeatCount + 1
   line = fA.readline()
 fA.close()

fResult.flush()
 fResult.close()

fA = open(resultTempFile)

fA.close()
fOut.flush()
fOut.close()

print("比较完成，重复数据{0}条".format(repeatCount))

os.rename(resultTempFile, "result")

#STEP3：结束后把临时文件都删掉
print("删除临时文件...\n")
while tempFileNo > 0:
 tempFileName = "temp{0}".format(tempFileNo)
 os.remove(tempFileName)
 tempFileNo = tempFileNo - 1

print("脚本结束。\n")

来源：https://blog.csdn.net/qyshooter/article/details/53508924