Is it a bug?

[Diez B. Roggisch]

Darren Cui Liang wrote:
> Hi, there!
> 
> Now I am working around with the "logging" module. Here is the code:
> 
> 
>  >>> import logging
>  >>> log1=logging.getLogger("a")
>  >>> log1.critical("msg")
> No handlers could be found for logger "a"
>  >>> logging.critical("msg")
> CRITICAL:root:msg
> 
> Since every "logger" is under the "root logger", and if no handler is 
> found for the logger, the message will be passed to upper level loggers, 
> until the  root,
> then why do I get the msg: No handlers could be found for logger "a"

The error-message is always for the used logger - but it will search the 
list of its parents for appropriate handlers. So setting a handler on a 
logger foo makes the logger foo.bar find it. Or, alternatively, obtain a 
reference tto the root-logger,  and set your handler there. Then all 
loggers will find it.

Diez