I just do this myself in my text editor (vim): [image: sets-py.png] But this is just cosmetic because I like to look at it this way. The actual file on disk contains `set()`, `<=`, `in`, `not in` and wouldn't be a problem for anyone without the same fonts installed, or require anyone to know odd key combos.
On Thu, Mar 17, 2022 at 8:35 AM Michael Smith <mich...@smith-li.com> wrote: > Hmm, I think the idea of the mathematical symbol is interesting, but I > think users are more interested in constructing a new, eventually-not-empty > set, than referencing the empty set. > > Semantically, I don't know if ∅() is satisfying. > > On Thu, Mar 17, 2022 at 08:19 Stéfane Fermigier <s...@fermigier.com> wrote: > >> The “correct” (according to Bourbaki) mathematical notation for an empty >> set is “∅" (aka Unicode U+2205, or HTML ∅) >> >> Some time ago, for a project which had a lot of empty sets, I tried to >> use this symbol as a short hand for set(). But: >> >> >>> ⦰ = set() >> File "<stdin>", line 1 >> ⦰ = set() >> ^ >> SyntaxError: invalid character '⦰' (U+29B0) >> >>> ø = set() >> >>> >> >> In other words, “⦰” is illegal as an identifier in Python (same for ⌀ >> aka U+2300 DIAMETER SIGN), but “ø” (aka U+00F8 LATIN SMALL LETTER O WITH >> STROKE) is legal ! >> >> So I used "⌀" instead of “⦰”, but I eventually dropped the whole idea >> because, IIRC, some tools weren’t too happy with it. >> >> Still, I guess it wouldn’t be neither too hard nor two disruptive to >> accept “⦰” as well as some other mathematical characters as identifiers in >> Python. >> >> Since once of the application domains where Python shines nowadays is >> mathematics (numerical, but also symbolic), I think it’s a shame that we >> are preventing to use the proper unicode characters to designate some >> universal mathematical objects. >> >> More info here: https://en.wikipedia.org/wiki/Null_sign >> >> S. >> >> On 13 Mar 2022 at 22:52:16, joao.p.f.batista...@gmail.com wrote: >> >>> Currently: >>> l = [] # new empty list >>> t = () # new empty tuple >>> s = set() # new empty set (no clean and consistent way of initializing >>> regarding the others) <<< >>> d = {} # new empty dictionary >>> >>> Possible solution: >>> s = {} # new empty set >>> d = {:} # new empty dictionary (the ":" is a reference to key-value >>> pairs) >>> >>> Current workaround at least for consistency: >>> l = list() # new empty list >>> t = tuple() # new empty tuple >>> s = set() # new empty set >>> d = dict() # new empty dictionary >>> >>> However, it doesn't feel right to not be able to initialize an empty set >>> as cleanly and consistently as lists, tuples and dictionaries in both forms. >>> _______________________________________________ >>> Python-ideas mailing list -- python-ideas@python.org >>> To unsubscribe send an email to python-ideas-le...@python.org >>> https://mail.python.org/mailman3/lists/python-ideas.python.org/ >>> Message archived at >>> https://mail.python.org/archives/list/python-ideas@python.org/message/OPWEKLLGT6RWMEHC4SLEZ2LSRVCSS4GP/ >>> Code of Conduct: http://python.org/psf/codeofconduct/ >>> >> >> >> -- >> Stefane Fermigier - http://fermigier.com/ - http://twitter.com/sfermigier >> - http://linkedin.com/in/sfermigier >> Founder & CEO, Abilian - Enterprise Social Software - >> http://www.abilian.com/ >> Co-Founder & Co-Chairman, National Council for Free & Open Source >> Software (CNLL) - http://cnll.fr/ >> Co-Founder & Chairman, Association Professionnelle Européenne du Logiciel >> Libre (APELL) - https://www.apell.info/ >> Co-Founder & Spokesperson, European Cloud Industrial Alliance (EUCLIDIA) >> - https://www.euclidia.eu/ >> Founder, PyParis & PyData Paris - http://pyparis.org/ & http://pydata.fr/ >> _______________________________________________ >> Python-ideas mailing list -- python-ideas@python.org >> To unsubscribe send an email to python-ideas-le...@python.org >> https://mail.python.org/mailman3/lists/python-ideas.python.org/ >> Message archived at >> https://mail.python.org/archives/list/python-ideas@python.org/message/D3SSAHRXYHPAM4NW3E6XC3J3AL625PGL/ >> Code of Conduct: http://python.org/psf/codeofconduct/ >> > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/Z43FW7AEEVFXJZ5CVLAPPD2A2PCMLOMY/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Keeping medicines from the bloodstreams of the sick; food from the bellies of the hungry; books from the hands of the uneducated; technology from the underdeveloped; and putting advocates of freedom in prisons. Intellectual property is to the 21st century what the slave trade was to the 16th.
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