python: updating file by finding unique values between two files, and then appending further data to bottom -

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i haven't got idea python. have file, substance.txt, list of 4k substances. have log file, log.txt, contains updates these substances @ moment, manually reflecting in substance.txt. log has format + tab @ start if new concept or -tab @ start if concept should removed substance.txt

using python, tying go through , first, copy in substance.txt not in log new file. then, trying go through logfile , append has '+ tab' bottom of new file. give me existing substance.txt content not affected + new terms log.txt , have removed concepts flagged in log.txt removal.

this code:

import re import fileinput  #  write concepts not not in log  open("log.txt", 'r') f,  open("substance.txt", "r") oldfile,       open('new_substance.txt', 'w') newfile:  withconceptsremoved = [x x in oldfile if x not in f] newfile.write(withconceptsremoved)  #  new file has comments neither positive or negative in log.  if copy positive ones, we've removed negatives  #  write new additions bottom of new file  line in f:     if '+\t' in line:         addedconcept = line.replace('+\t','1\t')         newfile.write(addedconcept)

this error:

line 8, in newfile.write(withconceptsremoved) typeerror: expected character buffer object

if remove 

withconceptsremoved = [x x in oldfile if x not in     newfile.write(withconceptsremoved)

it works. looked @ typeerror: expected character buffer object - while trying save integer textfile didn't understand it

i tried code , found several issues prevented wanted.

  • the list "withconceptsremoved" needs converted string stated in question comments
  • you reading "f" 2 times, need seek file start each time (or try read once)
  • the "if x not in f" not work cause need use list instead of "f"
  • you not taking "-\t" , "+\t" account when doing "if x not in f"

i fixed issues , seems working fine me.

here's updated code came with:

import re import fileinput  #  write concepts not not in log  open("log.txt", 'r') f,  open("substance.txt", "r") oldfile, open('new_substance.txt', 'w') newfile:     # read f once , convert list     loglist = list(f)     # remove exists in f either +\t or -\t     withconceptsremoved = [x x in oldfile if ('-\t'+x not in loglist , '+\t'+x not in loglist)]     # convert string , write file     withconceptsremoved = "".join(withconceptsremoved)     newfile.write(withconceptsremoved)     #  new file has comments neither positive or negative in log.  if copy positive ones, we've removed negatives     #  write new additions bottom of new file      line in loglist:         if '+\t' in line:             addedconcept = line.replace('+\t','1\t')             newfile.write(addedconcept)

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