Bug in Python Renaming Program…No such file or Dir

问题:

I'm trying to build a little renaming program to help save me time in the future. Basically it will go through directories I point it too and rename files if they meet certain criteria.

I have written what I need but I have a bug in the very beginning that I can't figure out.

Here is the code:

import os
import fnmatch

for file in os.listdir("""/Users/Desktop/TESTME"""):
    if fnmatch.fnmatch(file,'MISC*'):
        os.rename(file, file[4:12] + '-13-Misc.jpg')

When I try to run it I am getting this:

Traceback (most recent call last):
  File "/Users/Documents/Try.py", line 6, in <module>
    os.rename(file, file[4:12] + '-13-Misc.jpg')
OSError: [Errno 2] No such file or directory

I also tried this:

if fnmatch.fnmatch(file,'MISC*'):
    fun = file[4:12] + '-13-Misc.jpg'
    os.rename(file, fun)

But I get the same thing.

It's not recognizing the file as a file. Am I going about this the wrong way?

回答1:

You'll need to include the full path to the filenames you are trying to rename:

import os
import fnmatch

directory = "/Users/Desktop/TESTME"
for file in os.listdir(directory):
    if fnmatch.fnmatch(file, 'MISC*'):
        path = os.path.join(directory, file)
        target = os.path.join(directory, file[4:12] + '-13-Misc.jpg'
        os.rename(path, target)

The os.path.join function intelligently joins path elements into a whole, using the correct directory separator for your platform.

回答2:

The function os.listdir() only returns the file names of the files in the given directory, not their full paths. You can use os.path.join(directory, file_name) to reconstruct the full path of the file.

You could also do this in bash:

cd /Users/Desktop/TESTME/
for f in MISC*; do mv "$f" "${f:4:8}-13-Misc.jpg"; done