optimization question
Brian Quinlan
brian at sweetapp.com
Sun Aug 11 15:18:09 EDT 2002
Andrew Koenig wrote:
> can I count on the implementation not to form s[i:j] as a new
> substring?
You can't:
0 SET_LINENO 1
3 LOAD_GLOBAL 0 (s)
6 LOAD_GLOBAL 1 (i)
9 LOAD_GLOBAL 2 (j)
12 SLICE+3
13 LOAD_GLOBAL 3 (t)
16 COMPARE_OP 2 (==)
SLICE+3 implements TOS = TOS2[TOS1:TOS]
I started writing a lazy-slicing PEP/implementation once but the
implementation would have been hard to maintain and there would have
been backwards compatibility problems at the C API level.
Cheers,
Brian
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