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Sometimes log files grow very quickly and consume too much disk space (e.g. DEBUG), so compress old log files saves disk space without losing the information from log files.
I propose to add a "gzip" or "compress" argument to RotatingFileHandler and TimedRotatingFileHandler to select the number of old files you want to compress.
For example, if you set the argument to 0 (default) no files are gzipped , but if you set it to 3 you get the following log files:
app.log
app.log.1
app.log.2
app.log.3.gz
app.log.4.gz
...
app.log.n.gz
For TimedRotatingFileHandler it works similar, gzipping from the n-th newer log file to the oldest log file:
app.log
app.log.2011年12月01日
app.log.2011年11月30日
app.log.2011年11月29日.gz
app.log.2011年11月28日.gz
...
A possible patch is attached