[docs] [issue29105] code or doc improvement for logging.handlers.RotatingFileHandler

[iMath]

New submission from iMath:

For 
class logging.handlers.RotatingFileHandler(filename, mode='a', maxBytes=0, backupCount=0, encoding=None, delay=0) 

if backupCount is zero and maxBytes is non-zero, the log file size could exceed maxBytes, i.e. we are not able to restrict the log file size using RotatingFileHandler at this case .
I suggest add the above description to the doc 
https://docs.python.org/3.6/library/logging.handlers.html#logging.handlers.RotatingFileHandler
If possible , set backupCount=1 by default to avoid this pitfall as much as possible.

The doc right now just says "if either of maxBytes or backupCount is zero, rollover never occurs.", it is too difficult to understand the meaning of 'Rollover' to aviod the pitfall .

----------
assignee: docs at python
components: Documentation
messages: 284277
nosy: docs at python, redstone-cold
priority: normal
severity: normal
status: open
title: code or doc improvement for logging.handlers.RotatingFileHandler
type: enhancement
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29105>
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