#5970: [with patch, needs work] Weak references in Polynomial Ring cache
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Reporter: SimonKing | Owner: malb
Type: defect | Status: new
Priority: blocker | Milestone: sage-4.0
Component: commutative algebra | Keywords: polynomial ring cache weak
reference
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Comment(by SimonKing):
At http://docs.python.org/library/weakref.html they say:
Caution: Because a WeakKeyDictionary is built on top of a Python
dictionary, it must not change size when iterating over it. This can be
difficult to ensure for a WeakKeyDictionary because actions performed by
the program during iteration may cause items in the dictionary to vanish
“by magic” (as a side effect of garbage collection).
Can this be part of the trouble with my patch?
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5970#comment:5>
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Sage - Open Source Mathematical Software: Building the Car Instead of
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