On 08/12/2016 22:31, Chris Angelico wrote:
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?
I get this (although I suspect Thunderbird will screw up the tabs); the
code I used follows at the end:
L U L->U U->L
A a A A a Letters
65 97 65 65 97 Ordinals
1 1 1 1 1 Lengths
32 32 32 32 32
1 1 1 1 1
ß ß SS SS ss
223 223 83 83 115
1 1 2 2 2
ẞ ß ẞ SS ß
7838 223 7838 83 223
1 1 1 2 1
ı ı I I i
305 305 73 73 105
1 1 1 1 1
İ i̇ İ İ i̇
304 105 304 73 105
1 2 1 2 2
i i I I i
105 105 73 73 105
1 1 1 1 1
I i I I i
73 105 73 73 105
1 1 1 1 1
Å å Å Å å
8491 229 8491 197 229
1 1 1 1 1
σ σ Σ Σ σ
963 963 931 931 963
1 1 1 1 1
ς ς Σ Σ σ
962 962 931 931 963
1 1 1 1 1
σ σ Σ Σ σ
963 963 931 931 963
1 1 1 1 1
z z Z Z z
122 122 90 90 122
1 1 1 1 1
I've added A, space and z.
As I said some characters have ill-defined upper and lower case
conversions, even if some aren't as esoteric as I'd thought.
In English however the conversions are perfectly well defined for A-Z
and a-z, while they are not meaningful for characters such as space, and
for digits.
In English such conversions are immensely useful, and it is invaluable
for many purposes to have upper and lower case interchangeable (for
example, you don't have separate sections in a dictionary for letters
starting with A and those starting with a).
So it it perfectly possible to have case conversion defined for English,
while other alphabets can do what they like.
It is a little ridiculous however to have over two thousand distinct
files all with the lower-case normalised name of "harry_potter".
What were we talking about again? Oh yes, belittling me because I work
with Windows!
---------------
tab=" "
def ord1(c): return ord(c[0])
def showcases(c):
print (c,tab,c.lower(),tab,c.upper(),tab,c.lower().upper(),tab,
c.upper().lower())
def showcases_ord(c):
print (ord1(c),tab,ord1(c.lower()),tab,ord1(c.upper()),tab,
ord1(c.lower().upper()),tab,ord1(c.upper().lower()))
def showcases_len(c):
print (len(c),tab,len(c.lower()),tab,len(c.upper()),tab,
len(c.lower().upper()), tab,len(c.upper().lower()))
s="A ßẞıİiIÅσςσz"
print ("Org L U L->U U->L")
for c in s:
showcases(c)
showcases_ord(c)
showcases_len(c)
print()
--
Bartc
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