Performance Tracker project update

Chuck Swiger cswiger at
Fri Feb 8 20:15:34 UTC 2008

On Feb 8, 2008, at 11:42 AM, Ivan Voras wrote:
>> I'm not a python guru by any means, but I think .pyc files probably  
>> have data
>> about the .py they are generated from because there's some sort of
>> auto-generation available.  It may be possible to not store them at  
>> all and
>> just generate them before you use them or add some magic build  
>> flags to cause
>> them to store some sort of cooked values.  I'm not sure where  
>> the .pyo files
>> come from.
> .pyc/.pyo contain at least the timestamp of the original .py file  
> and maybe a compilation timestamp. You can indeed safely delete  
> all .pyc and .pyo files and forget about them - the only penalty  
> will be slightly slower application startup times as the .py files  
> are compiled every time.

Yep, that's right.

> .pyo are optimized version of .pyc.  AFAIK currently the  
> optimizations are not worth it.

Historically, the Python optimizer wasn't capable of doing much, true,  
but the more recent versions of the optimizer can actually do some  
peephole optimizations like algorithmic simplification and constant  


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