Implement C's Switch in Python 3
Bob van der Poel
bob at mellowood.ca
Sun Feb 3 16:01:24 EST 2019
On Sun, Feb 3, 2019 at 1:35 PM DL Neil <PythonList at danceswithmice.info>
> On 3/02/19 10:16 PM, Chris Angelico wrote:
> > On Sun, Feb 3, 2019 at 8:09 PM DL Neil <PythonList at danceswithmice.info>
> >> On 3/02/19 9:45 PM, Chris Angelico wrote:
> >>> Which is why I always write dates in sorted format, usually eschewing
> >>> delimiters:
> >>> //CJA 20160511: Is this still happening? I don't remember seeing it in
> >>> three parts of forever.
> >> Sure is. It is an acceptable alternative under the ISO standard.
> > Not sure if you're responding to the content of the comment there;
> Comment? I don't see no #, ''', or """!
> (am teasing)
> [ccyymmdd cf ccyy-mm-dd]
> >> Some would say it is more sensible to use when storing data because it
> >> removes the dash/hyphen separators in exchange for implying the
> >> fixed-format. (more bytes/characters saved if extend to include the
> >> I'm not going there - recalling folk from these memory-is-cheap times
> >> being less able to understand why we used to save 'expensive' storage
> >> space by using yy-years (instead of ccyy) and thus 'causing' "the
> >> millennium bug" aka Y2K!
> > Skipping the delimiter isn't about saving space, it's about
> > consistency. If I say "non-delimited sorted date", you can almost
> > certainly write out a character-for-character identical date - handy
> > if you want to search a bunch of files, for instance. Having
> > delimiters leaves people free to dispute whether they should be
> > slashes, hyphens, dots, or maybe something else.
> This logic indisputable.
> However, the whole purpose of an ISO standard is to remove "dispute",
> locally and internationally! Thus, if not sufficiently-well stated
> earlier, the standard is actually for information interchange purposes.
> >> I find it much slower to decode than reading the same with embedded
> >> separators!
> > Sure. I mainly use it in contexts where the most important information
> > is simply "that's a date", rather than actually caring what the date
> > *is*.
> [paras re-ordered]
> In case other readers are following-along-at-home, and the (above)
> purpose of the standard was insufficiently obvious, I did a bit of
> review 'homework':
> - ISO standards are still not $free
> - a good write-up from the ISO appears on the Wayback machine at
> - the above makes the point about "interchange" and offers similar
> examples of date-confusion to those 'here'/earlier
> - mention is made of formats including/excluding delimiters
> (I haven't been able to check this, but can't find any evidence that
> separators other than "-" are allowed (in dates) )
> - in lieu of the ISO text, those of us working over the Internet will
> turn to RFC 3339
> - this is a slight simplification of the ISO standard
> - the ABNF appendix *requires* a dash/hyphen as (date) separator
> - Markus Kuhn at Cambridge (British university) provides a readable and
> thought-provoking summary at https://www.cl.cam.ac.uk/~mgk25/iso-time.html
> - uses dashes/hyphens
> - discusses international considerations (I've just learned that the
> Chinese date notation preceded the ISO order, as did the conventions of
> a number of other countries)
> - supports the compact/'no debate' format "The hyphens can be omitted if
> compactness of the representation is more important than human
> readability" (as well as caring for my fading vision)
> >> I wouldn't use it in a 'visible' situation though, eg a fileNM. Yes, it
> >> is shorter, but as my eyes age (they are already older than my teeth!),
> > Guess your teeth better work on catching up...
> Can't put them under the pressure of thinking it is a race - they could
> decide to drop out!
> >>> That said, I am aware that I am not in any way a "normal person".
> >>> Using month names as per your other example is probably a fair
> >>> compromise with other humans.
> In this life, one does have to make allowances...
> >> There's normal and there's normal - like it's tomato or tomato?
> > I dunno. I'm the kind of normal that likes tomatoes (not to be
> > confused with tomatoes). Does that help?
> If you like tomatoes, and tomatoes are fruit, do you (normally) chug
> tomato sauce (ketchup) as if it is fruit juice?
I'm surprised that no one has yet addressed the year 10000 problem.
Hopefully we're doing numeric, not alpha sorts on the stuff before the 1st
'-'. And, the compact versions will really screw up :).
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Bob van der Poel ** Wynndel, British Columbia, CANADA **
EMAIL: bob at mellowood.ca
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