John Nagle, 31.08.2010 21:03:
On 8/30/2010 8:38 AM, Tobias Weber wrote:
whenever I type an "object literal" I'm unsure what optimisation will do
to it.
CPython is a "naive interpreter". It has almost no optimization.
It doesn't even really comprehend "constants".
This is an implementation problem, not a language problem.
Shed Skin has serious optimization but limits the language.
PyPy has been trying for years, but it still barely works.
Iron Python seems to be nearing end of life, as Microsoft
phases it out. Unladen Swallow seems to be in trouble; it's
been almost a year since the last "quarterly release".
To continue the list, Cython also has a couple of optimisations for
literals. It caches simple immutable constants, applies numeric constant
folding and it's obviously a lot faster in packing tuples and lists than
CPython as it avoids the interpreter loop. It also optimises away the
literal sequences in "in" tests such as
if x in (1,2,3):
...
which, in the best case of integer literals, even compile down into C
switch statements.
Stefan
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