[Python-ideas] [Python-Dev] What's the status of PEP 505: None-aware operators?
stephanh42 at gmail.com
Wed Nov 29 16:56:08 EST 2017
Op 29 nov. 2017 22:35 schreef "Greg Ewing" <greg.ewing at canterbury.ac.nz>:
It would read better with some kind of pronoun in there:
A if it is not None else C
Hypercard's Hypertalk had a special variable "it" that
worked sort of like that.
I considered that, but there are two issues.
1. Backward-incompatible change
2. The semantics of
A if B else C
now depends on if B contains 'it',
in which case A gets evaluated unconditionally and prior to B.
What if evaluation of 'it' is itself conditional, e.g.
print("hello") if a or it else print("goodbye")
Note that in the
A if <binary_relation> B else C
proposal the evaluation of the implicit 'it' is never conditional in that
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