Created
February 4, 2011 00:28
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Python: Proper multibyte character counting (for Twitter)
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# Example of making sure that multibyte characters are counted | |
# properly with regard to APIs such as Twitter. | |
# | |
# See http://dev.twitter.com/pages/counting_characters | |
# | |
# Uses example from above link: | |
# cafe (with diacritical): | |
# 0x63 0x61 0x66 0xC3 0xA9 (composed character) | |
# 0x63 0x61 0x66 0x65 0xCC 0x81 (e + combining diacritical) | |
from unicodedata import normalize | |
if __name__ == "__main__": | |
print "value\trepr\t\tlen" | |
a="\x63\x61\x66\x65\xCC\x81" | |
b="\x63\x61\x66\xC3\xA9" | |
print "----- str -----" | |
print "%s\t%s\t%s" % (a, repr(a), len(a)) | |
print "%s\t%s\t%s" % (b, repr(b), len(b)) | |
print "----- unicode -----" | |
uni_a = unicode(a, 'utf-8') | |
uni_b = unicode(b, 'utf-8') | |
print "%s\t%s\t%s" % (uni_a, repr(uni_a), len(uni_a)) | |
print "%s\t%s\t%s" % (uni_b, repr(uni_b), len(uni_b)) | |
print "----- Unicode Normalization Form C -----" | |
norm_a = normalize("NFC", uni_a) | |
norm_b = normalize("NFC", uni_b) | |
print "%s\t%s\t%s" % (norm_a, repr(norm_a), len(norm_a)) | |
print "%s\t%s\t%s" % (norm_b, repr(norm_b), len(norm_b)) | |
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value repr len | |
----- str ----- | |
café 'cafe\xcc\x81' 6 | |
café 'caf\xc3\xa9' 5 | |
----- unicode ----- | |
café u'cafe\u0301' 5 | |
café u'caf\xe9' 4 | |
----- Unicode Normalization Form C ----- | |
café u'caf\xe9' 4 | |
café u'caf\xe9' 4 |
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