[New-bugs-announce] [issue28014] Strange interaction between methods in subclass of C OrderedDict

Zachary Ware report at bugs.python.org
Wed Sep 7 23:28:02 EDT 2016

New submission from Zachary Ware:

I'm not certain that the implementation of this subclass of OrderedDict is actually sane, but it works in 3.4 and fails in 3.5+.

The buggy implementation:

class SimpleLRUCache(OrderedDict):

    def __init__(self, size):
        self.size = size

    def __getitem__(self, item):
        value = super().__getitem__(item)
        return value

    def __setitem__(self, key, value):
        while key not in self and len(self) >= self.size:
        super().__setitem__(key, value)

When trying to add a new item after `size` items are already in the cache, it will throw a KeyError with the key of the item in the oldest position.  Something like:

>>> s = SimpleLRUCache(2)
>>> s['t1'] = 1
>>> s['t2'] = 2
>>> s['t2'] # gives 2, properly moves 2 to the end
>>> s['t3'] = 3

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "simple_lru.py", line 14, in __setitem__
  File "simple_lru.py", line 9, in __getitem__
KeyError: 't3'

I can work around the failure by implementing __getitem__ as follows:

    def __getitem__(self, item):
        value = super().__getitem__(item)
        del self[item]
        self[item] = value
        return value

Attached is a script with a couple of tests that pass with 3.4 and fail with 3.5+.

files: simple_lru.py
messages: 274959
nosy: eric.snow, zach.ware
priority: normal
severity: normal
status: open
title: Strange interaction between methods in subclass of C OrderedDict
type: behavior
versions: Python 3.5, Python 3.6
Added file: http://bugs.python.org/file44458/simple_lru.py

Python tracker <report at bugs.python.org>

More information about the New-bugs-announce mailing list