Python script

So I'm making a Python script that posts on Imageboards using urllib, but I am having troubles on the part that I have to specify the file.

If i just put the file path there, it'll say that there's no file. I expected that anyway.

So I'm asking the programmers here, how do I upload files to the imageboard through Python?

I tried reading the documentation of urllib 1 and 2 but I didn't found any concrete information on this.

I assume you're on winders.
Use forward slashes in the path