Mercurial > cpython-lru_cache-weakref
view PCbuild/field3.py @ 87690:66c1c9f32567 default tip
Add use_weakref option to functools.lru_cache
The use_weakref option makes lru_cache create weak references to the function
arguments when creating the cache key, which prevents them from staying in the
memory forever even after all other references to them are gone.
This is a proof of concept for http://bugs.python.org/issue19859
| author | Radomir Dopieralski <devel@sheep.art.pl> |
|---|---|
| date | Tue, 03 Dec 2013 16:02:48 +0100 |
| parents | dcedd32f06de |
| children |
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# An absurd workaround for the lack of arithmetic in MS's resource compiler. # After building Python, run this, then paste the output into the appropriate # part of PC\python_nt.rc. # Example output: # # * For 2.3a0, # * PY_MICRO_VERSION = 0 # * PY_RELEASE_LEVEL = 'alpha' = 0xA # * PY_RELEASE_SERIAL = 1 # * # * and 0*1000 + 10*10 + 1 = 101. # */ # #define FIELD3 101 import sys major, minor, micro, level, serial = sys.version_info levelnum = {'alpha': 0xA, 'beta': 0xB, 'candidate': 0xC, 'final': 0xF, }[level] string = sys.version.split()[0] # like '2.3a0' print(" * For %s," % string) print(" * PY_MICRO_VERSION = %d" % micro) print(" * PY_RELEASE_LEVEL = %r = %s" % (level, hex(levelnum))) print(" * PY_RELEASE_SERIAL = %d" % serial) print(" *") field3 = micro * 1000 + levelnum * 10 + serial print(" * and %d*1000 + %d*10 + %d = %d" % (micro, levelnum, serial, field3)) print(" */") print("#define FIELD3", field3)
