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| author | Antoine Pitrou <solipsis@pitrou.net> | 2010-01-16 18:37:38 (GMT) |
|---|---|---|
| committer | Antoine Pitrou <solipsis@pitrou.net> | 2010-01-16 18:37:38 (GMT) |
| commit | b7fbcd396fc4a366433cf6f26cae64fecb056099 (patch) | |
| tree | 15efa75386a0f8e2d8381267a0c2edd6b551aac3 /Misc | |
| parent | a8f480f54597cf20e460b12e17bb0416a8008868 (diff) | |
| download | cpython-b7fbcd396fc4a366433cf6f26cae64fecb056099.zip cpython-b7fbcd396fc4a366433cf6f26cae64fecb056099.tar.gz cpython-b7fbcd396fc4a366433cf6f26cae64fecb056099.tar.bz2 | |
Issue #6690: Optimize the bytecode for expressions such as `x in {1, 2, 3}`,
where the right hand operand is a set of constants, by turning the set into
a frozenset and pre-building it as a constant. The comparison operation
is made against the constant instead of building a new set each time it is
executed (a similar optimization already existed which turned a list of
constants into a pre-built tuple). Patch and additional tests by Dave
Malcolm.
Diffstat (limited to 'Misc')
| -rw-r--r-- | Misc/NEWS | 8 |
1 files changed, 8 insertions, 0 deletions
@@ -12,6 +12,14 @@ What's New in Python 3.2 Alpha 1? Core and Builtins ----------------- +- Issue #6690: Optimize the bytecode for expressions such as `x in {1, 2, 3}`, + where the right hand operand is a set of constants, by turning the set into + a frozenset and pre-building it as a constant. The comparison operation + is made against the constant instead of building a new set each time it is + executed (a similar optimization already existed which turned a list of + constants into a pre-built tuple). Patch and additional tests by Dave + Malcolm. + - Issue #7622: Improve the split(), rsplit(), splitlines() and replace() methods of bytes, bytearray and unicode objects by using a common implementation based on stringlib's fast search. Patch by Florent Xicluna. |