Custom Interfaces

[jagauthier]

Hello,

There is documentation about some custom interface here:
https://python-can.readthedocs.io/en/develop/interfaces.html

Given these two issues:
#1110
#1233

Is this method still valid?

I really don't quite understand how to implement a custom interface. It's a bit deeper into Python than I usually get.
So, I'm looking for a little guidance. IE: I've copied over an existing interface and I am going to modify it.

[zariiii9003]

The docs should still be valid.

[jagauthier]

Thanks. I've never created an installable python module. I went through the docs, and I did it. I added
entry_points={
'can.interface': [
"slcan_custom=slcan_custom:slcan_customBus",
]
},

to the setup.py file in the setuptools.setup() function.

I created a small virtualenv, and tried to use it:
bus = can.interface.Bus(bustype='slcan_custom', bitrate=500000, channel='/dev/tty0')

But I get this:
can.exceptions.CanInterfaceNotImplementedError: Cannot import class slcan_customBus from module slcan_customfor CAN interface 'slcan_custom': module 'slcan_custom' has no attribute 'slcan_customBus'

I looked at some of the other interfaces, and they seem to have something in __init__.py, like such:
from .slcan_custom import slcan_customBus

But that only gives me an error about top level imports.
attempted relative import beyond top-level package

[zariiii9003]

Your project structure is probably incorrect. Once you install your own package, you should be able to run from slcan_custom import slcan_customBus from a script. If that fails, then python-can will not be able to import your class either.

[jagauthier]

Yup, and I cannot do that either. I will re-evaluate the structure and try to figure it out. Python's import nuances have never been a strength for me. Like.. apparently, trying to do the import forces __init__.py to run, when I look at the other interfaces, seems to do the import as well. Well, thanks. I will continue to fight it!