[Tutor] python logging module: two handlers writing to the same file - okay?

[Ricardo Aráoz]

Kent Johnson wrote:
> Hans Fangohr wrote:
> 
>> (i) is this (as in the log.conf file) the right use of the logging
>> module to achieve what I need?
> 
> I think you understand the module correctly.
> 
>> (ii) in particular, it appears we have two filehandlers that write to
>> the same file (in mode 'a+'). While this seems to work fine in the
>> examples I have tested, I'd like some independent advice on whether
>> this is 'legal' (or whether it works by chance).
> 
> I don't know the answer, but it has nothing to do with the logging 
> module. The question is, can the same file reliably be opened twice for 
> writing in the same module.
> 
> Another option: If you configure logging in code, you could create two 
> StreamHandlers that log to the same file - open the file yourself and 
> pass it to both handlers. If you do this you will have to close the file 
> yourself somehow.
> 
> Kent
>

Well, the question would actually be if the logging module is smart
enough to find out that both your filehandlers are referring to the same
file and open it only once.