从finder执行时，python重命名脚本不起作用（Mac）

Question

Helly everyone,

I'm kind of new to python, but I have written a little script that helps me rename file extensions. It's very short, so I'll post it here:

import os

for filename in os.listdir("."):
    if filename.endswith("gd"):
        os.rename(filename, filename + ".dat")

Now, as I have several directories I need to execute this in, it was getting kind of annoying to always navigate to the folder in terminal and execute it from there using the commmand

python renamescrip.py

Now I stumbled across some advice that would make a python script execute upon double clicking in the Finder, which would make life a lot easier for me, as I would just need to copy and paste the renamescript.py into the folder in which I want to rename the files and double click on it to execute it.

I followed these instructions: http://skillfulness.blogspot.de/2010/12/how-to-run-python-script-from-mac-os-x.html , which show how to create a .command file.

However, when I double clicked the renamescript.command file, it didn't change the file names in the directory.

I also tried opening the .py file with Python Launcher, but that also didn't change the filenames.

Both times a terminal window opened, though, with the message:

cd '/path to directory with files to rename/' && '/usr/local/bin/pythonw'  '/path to directory with files to rename/renamescript.py' && echo Exit status: $? && exit 1
Exit status: 0
logout

or if I click on the .command file it's just:

/path to directory with files to rename/renamescript.command ; exit;
logout

What am I doing wrong?

Answer 1

When you double click, you are not running with the same directory form your current directory as when you run from the shell. This causes your os.listdir(".") to not find the files you think it should. You should change your directory at the beginning of your script with

os.chdir(os.path.dirname(os.path.abspath(__file__)))

before your os.listdir call