A WeakList class for storing objects using weak references in a list.
Table of Contents
Install it from pypi:
pip install weakreflist
or from sources:
git clone email@example.com:apieum/weakreflist.git cd weakreflist python setup.py install
Same as a list except that when a weakref-able variable is deleted, it is removed from the list.
Example for CPython:
from weakref import WeakList class A(object): """weakrefs don't function directly on object()""" objectA = A() my_list = WeakList([objectA]) assert len(my_list) == 1 del objectA assert len(my_list) == 0 # objectA removed from list
Pypy (probably jython, cython...) have a different implementation of garbage collector and it is known that weakrefs doesn't function the same way.
You need to explicitly call gc.collect() which has an impact on performance.
Example for other python implementations
from weakref import WeakList import gc class A(object): """weakrefs don't function directly on object()""" objectA = A() my_list = WeakList([objectA]) assert len(my_list) == 1 del objectA assert len(my_list) == 1 # gc not done gc.collect() # must be called assert len(my_list) == 0
Your feedback, code review, improvements or bugs, and help to document is appreciated. You can contact me by mail: apieum [at] gmail [dot] com
Test recommended requirements:
pip install -r dev-requirements.txt
Sometimes --spec-color doesn't function. Uninstall nosespec and nosecolor then reinstall nosecolor and nosespec separatly in this order (nosecolor first).
git clone firstname.lastname@example.org:apieum/weakreflist.git cd weakreflist nosetests --with-spec --spec-color ./weakreflist # or with watch # nosetests --with-spec --spec-color --with-watch ./weakreflist
- Thanks to BoonsNaibot to have contributed to:
- extended slicing support
- __reversed__, count, extend, insert methods.