How to pass path names to Python script by “dropping” files/folders over script icon

Question

I am working in Mac OS X and have been writing simple file/folder copy scripts in Python. Is there a way to drag and drop a folder on top of a Python script icon and pass the fi

Answer 1

What you might really like is Mac OS Services. They are Automator workflows which can nicely integrate into the operating system in a context-specifc manner: e.g. you can make your script appear in Finder's context menu when you select a folder.

You can make a service from python script in following way:

1. Open Automator.app and create a new Service;
2. On top of workflow block you select what kind of input your application expects (folders is your choice if I understand correctly);
3. Drag "Run Shell Script" block from left pane into workflow;

4. Now you can either use default bash shell (/bin/bash) to call your script:

   /full/path/to/your/python /full/path/to/your/script.py $@
   

5. Or use /usr/bin/python (default python) and paste your code directly into text block;

6. Don't forget to set Pass input: as arguments in top right corner of the block.

It's a little bit tricky to debug such workflows (as you won't see stdout & stderr). Possible workaround for debugging is to setup custom excepthook and output all exceptions into some plain text file:

import sys, traceback

def excepthook(type, exc, tb):
    with open("error.log", "a") as f:
        traceback.print_exc(file=f)

sys.excepthook = excepthook