Re: [Python-Dev] PEP 515: Underscores in Numeric Literals

2016年2月11日 20:25:48 -0800

On Thursday, February 11, 2016 8:10 PM, Glenn Linderman <[email protected]> 
wrote:
>On 2/11/2016 7:56 PM, David Mertz wrote:
>
>Great PEP overall. We definitely don't want the restriction to grouping 
>numbers only in threes. South Asian crore use grouping in twos.
>>https://en.m.wikipedia.org/wiki/Crore
>>
>Interesting... 3 digits in the least significant group, and _then_
 by twos. Wouldn't have predicted that one! Never bumped into that
 notation before!
The first time I used underscore separators in any language, it was a test 
script for a server that wanted social security numbers as integers instead of 
strings, like 123_45_6789.[^1] 
Which is why I suggested the style guideline should just say "meaningful 
grouping of digits", rather than try to predict what counts as "meaningful" for 
every program.
[^1] Of course in Python, it's usually trivial to stick a shim in between the 
database and the model thingy so I could just pass in "123-45-6789", so I don't 
expect to ever need this specific example.
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