[Python-Dev] an alternative to embedding policy in PEP 418 (was: PEP 418: Add monotonic clock)
ethan at stoneleaf.us
Wed Apr 4 18:18:51 CEST 2012
Lennart Regebro wrote:
> On Tue, Apr 3, 2012 at 18:07, Ethan Furman <ethan at stoneleaf.us> wrote:
>> What's unclear about returning None if no clocks match?
> Nothing, but having to check error values on return functions are not
> what you typically do in Python. Usually, Python functions that fail
> raise an error. Please don't force Python users to write pseudo-C code
> in Python.
You mean like the dict.get() function?
Plus, failure mode is based on intent: if the intent is "Give a clock
no matter what", then yes, an exception when that's not possible is the
way to go.
But if the intent is "Give me a clock that matches this criteria" then
returning None is perfectly reasonable.
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