Source code for

# coding: utf-8

This Listener simply prints to stdout / the terminal or a file.

import logging

from can.listener import Listener
from .generic import BaseIOHandler

log = logging.getLogger("")

[docs]class Printer(BaseIOHandler, Listener): """ The Printer class is a subclass of :class:`~can.Listener` which simply prints any messages it receives to the terminal (stdout). A message is turned into a string using :meth:`~can.Message.__str__`. :attr bool write_to_file: `True` iff this instance prints to a file instead of standard out """ def __init__(self, file=None, append=False): """ :param file: an optional path-like object or as file-like object to "print" to instead of writing to standard out (stdout) If this is a file-like object, is has to opened in text write mode, not binary write mode. :param bool append: if set to `True` messages are appended to the file, else the file is truncated """ self.write_to_file = file is not None mode = "a" if append else "w" super().__init__(file, mode=mode)
[docs] def on_message_received(self, msg): if self.write_to_file: self.file.write(str(msg) + "\n") else: print(msg)