API Proposal for Logging

By default writing to a logger would not go to STDOUT without a handler. One solution to this is to attach a handler when verbose is an integer and use the logger if it is passed in.

# Do not log
func(verbose=0)

# will create a stream handler to stdout
func(verbose=1)

# will write to the logger passed in
func(verbose=logger)

[thomasjpfan]

Good point. In this case we do not need to accept verbose=logger. A advanced user can still attach a handler to the global logger. (or the logger at the module level)

I still think it is useful to have an integer for verbosity.

[rth]

For instance, I think unless one sets the output stream to stdout, in a jupyter notebooks logging will be actually shown in the server logs

Since none of the models currently use logging, maybe this is rather a stdout vs stderr issue. I’ll try to investigate.