[Tutor] logging to cmd.exe

[Peter Otten]

Albert-Jan Roskam wrote:

[me]
> Or you follow the convention and log to stderr:
> 
> $ python3 -c 'import sys; print("\udc85", file=sys.stderr)'
> \udc85
> $ $ python3 -c 'import logging; logging.basicConfig();
> logging.getLogger().warn("\udc85")' > to_prove_it_s_not_stdout
> WARNING:root:\udc85

[Albert-Jan]
> That's perhaps the best choice. But will messages with logging
> level warning and lower also be logged to stderr?

That are two distinct aspects. You may specify both what is logged and where 
it is logged. 

The easiest way to set up the filter is again basicConfig():

$ python3 -c 'from logging import *; basicConfig(); warn("important"); 
info("nice to know")'
WARNING:root:important

While the default level is WARNING you may specify something else:

$ python3 -c 'from logging import *; basicConfig(level=INFO); 
warn("important"); info("nice to know")'
WARNING:root:important
INFO:root:nice to know