Convert can.Logger and can.LogReader into functions

[zariiii9003]

• convert can.Logger and can.LogReader into functions
• split listeners.rst into notifier.rst and file_io.rst.

[lumagi]

How can a None value make its way into the dictionary? Is there a root cause that would help the user mitigate the problem?

[zariiii9003]

This was already there since the mf4-PR, but you're right, it's not necessary. I removed it.

[lumagi]

This will throw an IndexError if the filename does not have the necessary number of suffixes. Might be better to catch the case and raise an appropriate message.

[zariiii9003]

I added a check for the the length of suffixes

[grant-allan-ctct]

The front page of python-can in github gives this code in the Example usage section:

   # or use an asynchronous notifier
   notifier = can.Notifier(bus, [can.Logger("recorded.log"), can.Printer()])

so we might have a lot of people building their code on top of the idea of the can.Logger being something that can be added to the list of Listeners. (I am one.) Will this still work as is ? If not, the example might need a tweak, and many folks might be interested in how to achieve the same outcome after this PR lands.

[zariiii9003]

so we might have a lot of people building their code on top of the idea of the can.Logger being something that can be added to the list of Listeners. (I am one.) Will this still work as is ? If not, the example might need a tweak, and many folks might be interested in how to achieve the same outcome after this PR lands.

It still works the same way as before. can.Logger was always used to dispatch an instance of another class.