Finder and "open with"

[hasii2011]

I am having the same problem trying to figure out what this guy on stack overflow asks:

https://stackoverflow.com/questions/73145905/how-to-receive-file-when-file-is-opened-in-python

Looked through Apple's plist documentation did not find any keys to help.

[ronaldoussoren]

I've posted an answer to that question, which is close to impossible to answer there due to lack of information.

In short, opening files in macOS by double clicking or dropping a file on the application icon results in a file open event (AppleEvents) that the application needs to handle. Most GUI libraries have a way convert those events into their regular event handling code.

You appear to be using wxWidgets, and that has some documentation on how to do this: https://wiki.wxwidgets.org/WxMac-specific_topics#File_associations. That package is targeting C++ code, but I expect that something similar can be done in Python code.