On Fri, Mar 30, 2018 at 01:29:53PM +0300, Serhiy Storchaka wrote:
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.
Assuming that bool is the built-in, and hasn't been shadowed or monkey-patched. -- Steve