CODEWITHSUNDEEP
python-3.xos.path
Moh
Moh

Reputation: 61

Python: read a string and use it to rename the file

I'm completely new to python and I'm trying to rename a set of files using a string on a specific line within the file and use it to rename the file. Such string is found at the same line in each file.

As an example:

I'm trying to use this code, but I fail to figure out how to get it working:

for filename in os.listdir(path):
  if filename.startswith("out"):
     with open(filename) as openfile:
        fourteenline = linecache.getline(path, 14)
           os.rename(filename, fourteenline.strip())

Upvotes: 0

Views: 2235

Answers (1)

Skandix
Skandix

Reputation: 1984

Take care providing the full path to the file, in case your not allready working in this folder (use os.path.join()). Furthermore, when using linecache, you dont need to open the file.

import os, linecache

for filename in os.listdir(path):
    if not filename.startswith("out"): continue # less deep
    file_path = os.path.join(path, filename) # folderpath + filename
    fourteenline = linecache.getline(file_path, 14) # maybe 13 for 0-based index?
    new_file_name = fourteenline[40:40+50].rstrip() # staring at 40 with length of 50
    os.rename(file_path, os.path.join(path, new_file_name))

useful ressources:

Upvotes: 1

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