On Tue, Oct 20, 2020 at 05:30:54PM +0300, Serhiy Storchaka wrote:
> I do not want to create tens of alternate PEPs with minor variations,
> and this issue is not worth a PEP. What is your opinion about this? Is
> it worth to include such optimization? For what kind of variables should
> it be applied? Should it include global '_'? Should it be merely an
> optimization (maybe controlled by the -O option) or change in the language?
Assuming that this actually has a benefit, in either speed or memory,
how about this?
1. Only eliminate local variables, never globals.
2. By default, only variables with a leading underscore are eliminated.
This will(?) avoid breaking tests for the debugger etc. that you
mentioned.
3. Under -O, allow more aggressive optimization that eliminates
non-underscore variables too.
4. This is an implementation feature, not a language promise. Other
interpreters do not have to follow.
5. To be clear, variables are only eliminated if they are assigned to,
but never written to:
def func():
_a = 1 # not eliminated
_b = 2 # eliminated
return _a
--
Steve
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