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[Python-Dev] Add a frozendict builtin type
Mark Shannonmark at hotpy.org
Tue Feb 28 19:13:01 CET 2012
Victor Stinner wrote:>>> * frozendict values must be immutable, as dict keys>> Why? That may be useful, but an immutable dict whose values>> might mutate is also useful; by forcing that choice, it starts>> to feel too specialized for a builtin.>> Hum, I realized that calling hash(my_frozendict) on a frozendict> instance is enough to check if a frozendict only contains immutable> objects. And it is also possible to check manually that values are> immutable *before* creating the frozendict.>> I also prefer to not check for immutability because it does simplify> the code :-)>> $ diffstat frozendict-3.patch> Include/dictobject.h | 9 +> Lib/collections/abc.py | 1> Lib/test/test_dict.py | 59 +++++++++++> Objects/dictobject.c | 256 ++++++++++++++++++++++++++++++++++++++++++-------> Objects/object.c | 3> Python/bltinmodule.c | 1> 6 files changed, 295 insertions(+), 34 deletions(-)>> The patch is quite small to add a new builtin type. That's because> most of the code is shared with the builtin dict type. (But the patch> doesn't include the documentation, it didn't write it yet.)>Could you create an issue for this on the tracker, maybe write a PEP.I don't think sending patches to this mailing list is the way to do this.Would you mind taking a look at how your code interacts with PEP 412.Cheers,Mark.
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