<div dir="ltr">On Mon, Nov 6, 2017 at 3:18 PM, Chris Barker <span dir="ltr"><<a href="mailto:chris.barker@noaa.gov" target="_blank">chris.barker@noaa.gov</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;border-left-color:rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>Klunky, and maybe we could come up with a standard way to do it and include that in numpy, but I'm not sure that ABCs are the way to do it.<br></div></div></div></div></blockquote></div><div><br></div><div>ABCs are *absolutely* the way to go about it. It's the only way baked into the Python language itself that allows you to register a class for purposes of `isinstance` without needing to subclass--i.e. duck-typing.</div><div><br></div><div>What's needed, though, is not just a single ABC. Some thought and design needs to go into segmenting the ndarray API to declare certain behaviors, just like was done for collections:</div><div><br></div><div><a href="https://docs.python.org/3/library/collections.abc.html">https://docs.python.org/3/library/collections.abc.html</a><br></div><div><br></div><div>You don't just have a single ABC declaring a collection, but rather "I am a mapping" or "I am a mutable sequence". It's more of a pain for developers to properly specify things, but this is not a bad thing to actually give code some thought. </div><div><br></div><div>Ryan</div><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><div>Ryan May<br><br></div></div></div>
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