[1.4.x] Fixed #18239 -- Subclassed HTMLParser only for selected Python versions

import HTMLParser as _HTMLParser

import re

import sys

current_version = sys.version_info

use_workaround = (

    (current_version < (2, 6, 8)) or

    (current_version >= (2, 7) and current_version < (2, 7, 3)) or

    (current_version >= (3, 0) and current_version < (3, 2, 3))

)

if not use_workaround:

    HTMLParser = _HTMLParser.HTMLParser

else:

    class HTMLParser(_HTMLParser.HTMLParser):

        """

        Patched version of stdlib's HTMLParser with patch from: