[Python-Dev] python optimization

Fri Sep 16 05:55:41 CEST 2005

Brett Cannon wrote:
>>I don't know to what extent these kind of optimizations are available to
>>cpython. For example, are constant calculations removed from loops?
>> If you mean ``2+3``, then yes.

Actually, no. Constant folding *could* be done, but it currently isn't:
 >>> def f():
... return 2+3
...
 >>> import dis
 >>> dis.dis(f)
 2 0 LOAD_CONST 1 (2)
 3 LOAD_CONST 2 (3)
 6 BINARY_ADD
 7 RETURN_VALUE
 8 LOAD_CONST 0 (None)
 11 RETURN_VALUE
 >>>
-- 
Greg Ewing, Computer Science Dept, +--------------------------------------+
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