[issue44152] .isupper() does not support Polytonic Greek (but .islower() does)

[E G]

New submission from E G <e...@antisigma.classics.utoronto.ca>:

Δημοϲθενικοί starts with an upper-case delta. 'Δημοϲθενικοί'.isupper() should 
yield "True".

Ἀεὶ also fails this test: it begins with a capital Alpha with a breathing.

εἰϲ is properly parsed: isupper() is False and islower() is True. 

Despite the problem with .isupper(), .capitalize() does seem to work properly: 
'ὦ' --> 'Ὦ' and 'ἂν' --> 'Ἂν'


a transcript follows

====

Python 3.9.5 (default, May  4 2021, 03:36:27)
        
        Greek vs .isupper(): seems like .islower() is properly implemented but 
that .isupper() is not

        >>> 'ζῳώδηϲ'.islower()
        True
        >>> 'Δημοϲθενικοί'.islower()
        False
        >>> 'Δημοϲθενικοί'.isupper()
        False
        >>> x = 'Ἀεὶ'
        >>> x.islower()
        False
        >>> x.isupper()
        False
        >>> x = 'εἰϲ'
        >>> x.isupper()
        False
        >>> x.islower()
        True
        >>> x = 'ἂν'
        >>> x.islower()
        True
        >>> x.isupper()
        False
        >>> x= 'ὦ'
        >>> x.isupper()
        False
        >>> x.islower()
        True

        >>> x.capitalize()
        'Ὦ'
        >>> 'ἂν'.capitalize()
        'Ἂν'

----------
messages: 393759
nosy: egun
priority: normal
severity: normal
status: open
title: .isupper() does not support Polytonic Greek (but .islower() does)
type: behavior
versions: Python 3.9

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<https://bugs.python.org/issue44152>
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