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"""

Utility functions for normalized Unicode string comparison.

Using Normal Form C, case sensitive:

>>> s1 = 'café'

>>> s2 = 'cafe\u0301'

>>> s1 == s2

False

>>> nfc_equal(s1, s2)

True

>>> nfc_equal('A', 'a')

False

Using Normal Form C with case folding:

>>> s3 = 'Straße'

>>> s4 = 'strasse'

>>> s3 == s4

False

>>> nfc_equal(s3, s4)

False

>>> fold_equal(s3, s4)

True

>>> fold_equal(s1, s2)

True

>>> fold_equal('A', 'a')

True

"""

from unicodedata import normalize

def nfc_equal(str1, str2):

return normalize('NFC', str1) == normalize('NFC', str2)

def fold_equal(str1, str2):

return (normalize('NFC', str1).casefold() ==

normalize('NFC', str2).casefold())