python-can

The python-can library provides Controller Area Network support for Python, providing common abstractions to different hardware devices, and a suite of utilities for sending and receiving messages on a CAN bus.

python-can runs any where Python runs; from high powered computers with commercial CAN to usb devices right down to low powered devices running linux such as a BeagleBone or RaspberryPi.

More concretely, some example uses of the library:

  • Passively logging what occurs on a CAN bus. For example monitoring a commercial vehicle using its OBD-II port.
  • Testing of hardware that interacts via CAN. Modules found in modern cars, motocycles, boats, and even wheelchairs have had components tested from Python using this library.
  • Prototyping new hardware modules or software algorithms in-the-loop. Easily interact with an existing bus.
  • Creating virtual modules to prototype CAN bus communication.

Brief example of the library in action: connecting to a CAN bus, creating and sending a message:

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#!/usr/bin/env python

"""
This example shows how sending a single message works.
"""

import can


def send_one():
    """Sends a single message."""

    # this uses the default configuration (for example from the config file)
    # see https://python-can.readthedocs.io/en/stable/configuration.html
    with can.interface.Bus() as bus:

        # Using specific buses works similar:
        # bus = can.interface.Bus(bustype='socketcan', channel='vcan0', bitrate=250000)
        # bus = can.interface.Bus(bustype='pcan', channel='PCAN_USBBUS1', bitrate=250000)
        # bus = can.interface.Bus(bustype='ixxat', channel=0, bitrate=250000)
        # bus = can.interface.Bus(bustype='vector', app_name='CANalyzer', channel=0, bitrate=250000)
        # ...

        msg = can.Message(
            arbitration_id=0xC0FFEE, data=[0, 25, 0, 1, 3, 1, 4, 1], is_extended_id=True
        )

        try:
            bus.send(msg)
            print(f"Message sent on {bus.channel_info}")
        except can.CanError:
            print("Message NOT sent")


if __name__ == "__main__":
    send_one()

Contents:

Known Bugs

See the project bug tracker on github. Patches and pull requests very welcome!

Documentation generated

Mar 23, 2021