Python replace matching contents in a file

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I am looking to compare to text files and replace matching texts with blanks. My files look like this,

File 1

L1 Abc
L2 HHS
L3 RTY
L4 TYU
L5 678

File 2

L1 Abc
L2 HHS
L3 RTY
L4 TYU
L5 678
L6 HTY
L7 KYU
L8 POI

I need to compare file 1 and file 2 and then replace matching contents in File 1 to be replaced with blanks.

I have written the following code in Python but its not replacing the values. How can I get the desired results. Should I use different approach ? Please advise...

Thanks in Advance.

What I have tried:

import re


newcontent: str=''
oldcontent: str=''

with open('C:\Temp\\test1.log', 'r') as content_file:
    newcontent = content_file.read()
    #print(newcontent)


def replaceData(txt):
    with open('C:\Temp\\test2.log', "r") as fout:
        oldcontent = fout.read()
        print(oldcontent)

    print('end of old content....')

    a=txt.replace(oldcontent,'')
    print(a)

replaceData(newcontent)

Posted 14-Nov-18 19:28pm

py.Net.JS

Updated 14-Nov-18 22:40pm

v2

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2 solutions

Solution 2

Something similar to

Python

with open("test1.log") as f:
    f1lin = f.readlines()

with open("test2.log") as f:
    f2lin = f.readlines()

f3lin = [s for s in f2lin if not (s in f1lin)]
with open("test3.log", "w+") as f:
  f.writelines(f3lin)

I suppose.

Posted 14-Nov-18 22:41pm

CPallini

Updated 14-Nov-18 22:44pm

v2

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Richard MacCutchan · Accepted Answer · 2018-11-14T22:32:00

You are trying to replace the complete text of the second file that occurs in the first. But that text does not exist in the first file, only a part of it. You should read the second file line by line and try the replace on just the text of that line. Something like: