On Fri, Dec 9, 2016 at 8:42 AM, BartC <b...@freeuk.com> wrote: > Python3 tells me that original, lower-case and upper-case versions are: > > ßẞıİiIÅσςσ > ßßıi̇iiåσςσ > SSẞIİIIÅΣΣΣ
Now lower-case the upper-case version and see what you get. And upper-case the lower-case version. Because x.upper().lower() should be the same as x.lower(), right? And x.lower().upper().lower() is the same too. Right? >>> x = "ßẞıİiIÅσςσ" >>> x.upper().lower() == x.lower() False >>> x.upper().lower() == x.lower().upper().lower() False > (Python2 failed to run the code: > > s="ßẞıİiIÅσςσ" > print (s) > print (s.lower()) > print (s.upper()) > ) I don't know what you mean by "failed", but you shouldn't have non-ASCII characters in Python 2 source code without a coding cookie. Also, you should be using a Unicode string. Or just stick with Py3. > But, given that, what's your point? That some esoteric Unicode characters > have ill-defined upper and lower case versions, and therefore it is > essential to treat them distinctly in EVERY SINGLE ALPHABET including > English? Yes, because it's Unicode's fault, isn't it. The world was so nice and simple before Unicode came along and created all these messes for us to have to deal with. And you're quite right - these characters are esoteric and hardly ever used. [1] And they're so ill-defined that nobody could predict or figure out what the upper-case and lower-case forms are. It's not like there are rules that come from the languages where they're used. > I guess that means that if I try a write a book about a character called > HarrY potter or james BOND then I cannot be sued. This is not legal advice, but I think you'll agree that "HarrY" is not equal to "Harry". Whether it's a good idea to have two files in the same directory that have those names, it's certainly the case that the names can be distinguished. (Sir HarrY is a very distinguished name.) And if you decide not to distinguish between "Y" and "y", then which of the above characters should be not-distinguished? ChrisA [1] Okay, to be fair, one of the ones I used *is* esoteric. But most of them aren't. -- https://mail.python.org/mailman/listinfo/python-list
