Ian Kelly wrote:
On Wed, May 16, 2012 at 3:33 PM, Ethan Furman <et...@stoneleaf.us> wrote:
Just hit a snag:
In cPython the deterministic garbage collection allows me a particular
optimization when retrieving records from a dbf file -- namely, by using
weakrefs I can tell if the record is still in memory and active, and if so
not hit the disk to get the data; with PyPy (and probably the others) this
doesn't work because the record may still be around even when it is no
longer active because it hasn't been garbage collected yet.
For PyPy I can use `'PyPy' in sys.version` to set a constant
(REFRESH_FROM_DISK in this case) to disable the cPython optimization; does
anyone know what strings to look for for the other implementations?
Python 2.7.1 (r271:86832, Nov 27 2010, 18:30:46) [MSC v.1500 32 bit
(Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
import sys
sys.subversion
('CPython', 'tags/r271', '86832')
Jython 2.5.2 (Release_2_5_2:7206, Mar 2 2011, 23:12:06)
[Java HotSpot(TM) Client VM (Sun Microsystems Inc.)] on java1.6.0_31
Type "help", "copyright", "credits" or "license" for more information.
import sys
sys.subversion
('Jython', 'tags/Release_2_5_2', '7206')
I don't know what IronPython or PyPy return, but it should be
something other than 'CPython'.
Thanks! That will do the trick. On CPython 2.4 .subversion does not
exist, so I'll use:
subversion = getattr(sys, 'subversion', None)
if subversion is not None and subversion[0] != 'CPython':
...
Hopefully all the others do have it defined (PyPy does, at least as of 1.8).
~Ethan~
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