29.03.18 18:06, Terry Reedy пише:
On 3/28/2018 11:27 AM, Serhiy Storchaka wrote:
The optimizer already changes semantic. Non-optimized "if a and True:"
would call bool(a) twice, but optimized code calls it only once.
Perhaps Ref 3.3.1 object.__bool__ entry, after " should return False or
True.", should say something like "Should not have side-effects, as
redundant bool calls may be optimized away (bool(bool(ob)) should have
the same result as bool(ob))."
Do you meant that it should be idempotent operation? Because
bool(bool(ob)) always have the same result as bool(ob)) if bool(ob)
returns True or False.
_______________________________________________
Python-Dev mailing list
Python-Dev@python.org
https://mail.python.org/mailman/listinfo/python-dev
Unsubscribe:
https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
