Barry Warsaw wrote:
> On Feb 03, 2010, at 11:59 AM, M.-A. Lemburg wrote:
>
>> How about using an optionally relative cache dir setting to let
>> the user decide ?
>
> Why do we need that level of flexibility?
It's very easy to implement (see the code I posted) and gives
you a lot of control with a single env variable.
Some use cases:
1. PYTHONCACHE=. (store the cache files in the same dir as the
.py file)
This settings mimics what we've had in Python for decades. Users
know about this Python behavior and expect it.
It's also the only reasonable way of shipping byte-code only
packages.
2. PYTHONCACHE=.pycache (store the cache files in a subdir of the
dir where the .py file is stored)
When using lots of cache files for multiple Python versions or
variants, .py source code directory can easily get cluttered
with too many such files.
Putting them into a subdir solves this problem. This would be
useful for developers running and testing the code with different
Python versions.
3. PYTHONCACHE=~/.python/cache (store the cache files in a user dir,
outside the Python source file dir)
This allows easy removal of all cache files and prevents
cluttering up the sys.path dirs with cache files or directories
altogether.
It's also handy if the source code dirs are not writable by
the user importing them. OTOH, every user would create a copy
of the cache files (this is what currently happens with setuptools
eggs and is very annoying).
--
Marc-Andre Lemburg
eGenix.com
Professional Python Services directly from the Source (#1, Feb 07 2010)
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