def download_unicodedata(version, output=HOME, no_zip=False):
    """Download Unicode data scripts and blocks."""
    files = [
        'UnicodeData.txt',
        'Scripts.txt',
        'Blocks.txt',
        'PropList.txt',
        'DerivedCoreProperties.txt',
        'DerivedNormalizationProps.txt',
        'CompositionExclusions.txt',
        'PropertyValueAliases.txt',
        'PropertyAliases.txt',
        'EastAsianWidth.txt',
        'LineBreak.txt',
        'HangulSyllableType.txt',
        'DerivedAge.txt',
        'auxiliary/WordBreakProperty.txt',
        'auxiliary/SentenceBreakProperty.txt',
        'auxiliary/GraphemeBreakProperty.txt',
        'extracted/DerivedDecompositionType.txt',
        'extracted/DerivedNumericType.txt',
        'extracted/DerivedNumericValues.txt',
        'extracted/DerivedJoiningType.txt',
        'extracted/DerivedJoiningGroup.txt',
        'extracted/DerivedCombiningClass.txt'
    ]

    files.append('ScriptExtensions.txt')
    if PY35:
        files.append('IndicPositionalCategory.txt')
    else:
        files.append('IndicMatraCategory.txt')
    files.append('IndicSyllabicCategory.txt')

    if PY34:
        files.append('BidiBrackets.txt')

    if PY37:
        files.append('VerticalOrientation.txt')

    http_url = 'http://www.unicode.org/Public/%s/ucd/' % version
    ftp_url = 'ftp://ftp.unicode.org/Public/%s/ucd/' % version

    destination = os.path.join(output, 'unicodedata', version)
    if not os.path.exists(destination):
        os.makedirs(destination)

    zip_data = not no_zip

    for f in files:
        file_location = os.path.join(destination, os.path.basename(f))
        retrieved = False
        if not os.path.exists(file_location):
            for url in (ftp_url, http_url):
                furl = url + f
                try:
                    print('Downloading: %s --> %s' % (furl, file_location))
                    response = urlopen(furl, timeout=30)
                    data = response.read()
                except Exception:
                    print('Failed: %s' % url)
                    continue
                with open(file_location, 'w') as uf:
                    uf.write(data.decode('utf-8'))
                retrieved = True
                break
            if not retrieved:
                print('Failed to acquire all needed Unicode files!')
                break
        else:
            retrieved = True
            print('Skipping: found %s' % file_location)

        if not retrieved:
            zip_data = False
            break

    if zip_data and not os.path.exists(os.path.join(output, 'unicodedata', '%s.zip' % version)):
        zip_unicode(output, version)
Download Unicode data scripts and blocks.