Question

have different files with same name, in different directories. In these files there are lines which are almost equal, I would like to take out only the last line of these ones( there are more lines after it) and write it in another file.

So far what I have done:

#!/usr/bin/env python

import os

def cd_grep():
   for file in os.listdir("."):
     if os.path.isfile(file):
       for line in open("graph.txt"):
                  if " 4.49" in line:                               
                       line_list=[line] 
   g = open('comparation','a') 
   g.write ("%s" % (line[0:4]))
   g.close()
os.chdir('4.294')
cd_grep()
os.chdir(os.pardir)
os.chdir('4.394')
cd_grep()
os.chdir(os.pardir)
os.chdir('4.494')
cd_grep()
os.chdir(os.pardir)
os.chdir('4.594')
cd_grep()
os.chdir(os.pardir)
os.chdir('4.694')
cd_grep()

I’ve created a list because I am gonna take only a specific information of the whole line.

Finally I got that this procedure only works for small files and only if the last line of the file contains the term I’m searching.
For big files, I got this message ( inside the file, which I was hoping to get the line):
Voluntary context switches: 3403

Any idea or suggestion will be very appreciate.

Answer 1

Not sure about the error you are receiving (after your last edit).

I have tried to rewrite the code a bit, hope it gives you a result similar to what you need (WARNING: not tested).

with open ('comparation', 'a') as write_file:
  for path, dirs, files in os.walk(os.getcwd()):
    for filename in [f for f in files if f == "graph.txt"]:
      filepath = os.path.abspath(os.path.join(path, filename))
      with open(filepath) as f:
        for line in f:
          if " 4.49" in line:
            last = line
        write_file.write("File: %s, Line: %s\n" % (filepath, last[0:4]))