utils.py 文件源码

def collapse_rfc2231_value(value, errors='replace',
                           fallback_charset='us-ascii'):
    if isinstance(value, tuple):
        rawval = unquote(value[2])
        charset = value[0] or 'us-ascii'
        try:
            return unicode(rawval, charset, errors)
        except LookupError:
            # XXX charset is unknown to Python.
            return unicode(rawval, fallback_charset, errors)
    else:
        return unquote(value)