Python 2.5.2: trying to open files recursively

Question

The script below should open all the files inside the folder \'pruebaba\' recursively but I get this error:

Traceback (most recent call last):
F

Answer 1

os.listdir lists both files and directories. You should check if what you're trying to open really is a file with os.path.isfile

Answer 2

You're trying to open everything you see. One thing you tried to open was a directory; you need to check if an entry is a file or is a directory, and make a decision from there. (Was the error IOError: [Errno 21] Is a directory not descriptive enough?)

If it is a directory, then you'll want to make a recursive call to your function to walk over the files in that directory as well.

Alternatively, you might be interested in the os.walk function to take care of the recursive-ness for you.

Answer 3

Use os.walk. It recursively walks into directory and subdirectories, and already gives you separate variables for files and directories.

import re
import os
from __future__ import with_statement

PATH = "/home/tirengarfio/Desktop/pruebaba"

for path, dirs, files in os.walk(PATH):
    for filename in files:
        fullpath = os.path.join(path, filename)
        with open(fullpath, 'r') as f:
            data = re.sub(r'(\s*function\s+.*\s*{\s*)',
                r'\1echo "The function starts here."',
                f.read())
        with open(fullpath, 'w') as f:
            f.write(data)