diff options
Diffstat (limited to 'Misc')
| -rw-r--r-- | Misc/NEWS | 18 |
1 files changed, 13 insertions, 5 deletions
@@ -12,11 +12,19 @@ What's New in Python 2.3 beta 2? Core and builtins ----------------- -- SF bug 742860: WeakKeyDictionary __delitem__ uses iterkeys. This - wasn't as threadsafe as it should be, was very inefficient, and could - raise RuntimeError if another thread mutated the dict during - __delitem__, or if a comparison function mutated it. A new - implementation of WeakKeyDictionary.__delitem__ repairs all that. +- SF bug 742860: "WeakKeyDictionary __delitem__ uses iterkeys". This + wasn't threadsafe, was very inefficient (expected time O(len(dict)) + instead of O(1)), and could raise a spurious RuntimeError if another + thread mutated the dict during __delitem__, or if a comparison function + mutated it. It also neglected to raise KeyError when the key wasn't + present; didn't raise TypeError when the key wasn't of a weakly + referencable type; and broke various more-or-less obscure dict + invariants by using a sequence of equality comparisons over the whole + set of dict keys instead of computing the key's hash code to narrow + the search to those keys with the same hash code. All of these are + considered to be bugs. A new implementation of __delitem__ repairs all + that, but note that fixing these bugs may change visible behavior in + code relying (whether intentionally or accidentally) on old behavior. - SF bug 705231: builtin pow() no longer lets the platform C pow() raise -1.0 to integer powers, because (at least) glibc gets it wrong |