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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def pretty_unicode(string):
 """ Make sure string is unicode, try to decode with utf8, or unicode escaped string if failed. """

    if isinstance(string, six.text_type):
        return string
    try:
        return string.decode("utf8")
    except UnicodeDecodeError:
        return string.decode('Latin-1').encode('unicode_escape').decode("utf8")