[New-bugs-announce] [issue7224] One obvious way to do interning
Alexander Belopolsky
report at bugs.python.org
Wed Oct 28 02:05:29 CET 2009
New submission from Alexander Belopolsky <belopolsky at users.sourceforge.net>:
Attached patch implements python-ideas proposal to return added or
existing element from set.add(). See
http://mail.python.org/pipermail/python-ideas/2009-October/006491.html .
In addition this patch contains a reimplementation of issue1507011 using
new behavior of set_add.
The two changes are independent an I would submit them separately if I
was more optimistic that any would be accepted. :-)
This submission is mostly for the benefit of users with applications
that create huge number of interned strings. Since the patch saves 8
bytes for each interned string, such application can see appreciable
memory savings.
I don't have such application and my tests show no difference between
patched and stock python. (For a data point, on start up stock python
creates about 2,000 interned strings.)
My own motivation for writing this patch was the same as for issue1507011: the code that uses a set to store interned strings is more
straightforward than code that uses a dict that stores strings twice,
both as key and value.
----------
components: Interpreter Core
files: set-add.diff
keywords: patch
messages: 94595
nosy: belopolsky
severity: normal
status: open
title: One obvious way to do interning
type: feature request
Added file: http://bugs.python.org/file15218/set-add.diff
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