Terry Reedy schrieb:
>> The first time a non str object is inserted or looked up, the dict
>> swiches to a more general lookup methods.
>
> This makes adding a string-only dict pretty trivial, if desired.
It's not as trivial as it seems. The switch over to the general lookup
method happens when a non str object is *looked up*.
d = {'a': None} # uses lookdict_string()
d.get(1, None) # d now uses lookdict()
"d->ma_lookup == lookdict_string" is a sufficient condition, not a
condicio sine qua non.
> Assuming that 3.x dicts are optimized for the 3.x string type, this is
> not a problem for 3.x ;-).
Well, it's always optimized for the str type - which happens to be
PyUnicodeObject in 3.x.
Christian
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
http://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
