[Jython-bugs] [issue1212] 'x' in dictionary much slower than dictionary.has_key('x')

[Pekka L. <re...@bu...>]

New submission from Pekka Laukkanen <pe...@ik...>:

On Jython it is much faster to test is an item in a dictionary with
'has_key' method than using 'in' keyword. The latter is normally
preferred because it is more idiomatic Python and also faster on
CPython. The attached example demonstrates this problem. When I execute
it on my system I got following results.

$ jython --version && jython in_vs_haskey.py 
Jython 2.2 on java
has_key_test dict 0.7
in_test dict 1.573
has_key_test UserDict 1.224
in_test UserDict 2.313

$ python --version && python in_vs_haskey.py 
Python 2.5.1
has_key_test dict 0.243
in_test dict 0.146
has_key_test UserDict 0.504
in_test UserDict 0.529

----------
files: in_vs_haskey.py
messages: 3971
nosy: laukpe
severity: normal
status: open
title: 'x' in dictionary much slower than dictionary.has_key('x')
Added file: http://bugs.jython.org/file590/in_vs_haskey.py

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Jython tracker <re...@bu...>
<http://bugs.jython.org/issue1212>
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