diff options
Diffstat (limited to 'Misc/NEWS')
| -rw-r--r-- | Misc/NEWS | 14 |
1 files changed, 6 insertions, 8 deletions
@@ -15,7 +15,7 @@ Core To enhance the usability of the .encode() method, the special casing of Unicode object return values was dropped (Unicode objects were auto-magically converted to string using the default encoding). - + Both methods will now return whatever the codec in charge of the requested encoding returns as object, e.g. Unicode codecs will return Unicode objects when decoding is requested ("äöü".decode("latin-1") @@ -116,13 +116,11 @@ Core to crash if the element comparison routines for the dict keys and/or values mutated the dicts. Making the code bulletproof slowed it down. -- Collisions in dicts now use polynomial division instead of multiplication - to generate the probe sequence, following an idea of Christian Tismer's. - This allows all bits of the hash code to come into play. It should have - little or no effect on speed in ordinary cases, but can help dramatically - in bad cases. For example, looking up every key in a dict d with - d.keys() = [i << 16 for i in range(20000)] is approximately 500x faster - now. +- Collisions in dicts are resolved via a new approach, which can help + dramatically in bad cases. For example, looking up every key in a dict + d with d.keys() = [i << 16 for i in range(20000)] is approximately 500x + faster now. Thanks to Christian Tismer for pointing out the cause and + the nature of an effective cure (last December! better late than never). Library |