How to use the bs4.dammit.EntitySubstitution function in bs4

if val is None:
                    decoded = key
                else:
                    if isinstance(val, list) or isinstance(val, tuple):
                        val = ' '.join(val)
                    elif not isinstance(val, str):
                        val = str(val)
                    elif (
                        isinstance(val, AttributeValueWithCharsetSubstitution)
                        and eventual_encoding is not None):
                        val = val.encode(eventual_encoding)

                    text = self.format_string(val, formatter)
                    decoded = (
                        str(key) + '='
                        + EntitySubstitution.quoted_attribute_value(text))
                attrs.append(decoded)
        close = ''
        closeTag = ''

        prefix = ''
        if self.prefix:
            prefix = self.prefix + ":"

        if self.is_empty_element:
            close = '/'
        else:
            closeTag = '' % (prefix, self.name)

        pretty_print = self._should_pretty_print(indent_level)
        space = ''
        indent_space = ''

def __new__(cls, original_value):
        match = cls.CHARSET_RE.search(original_value)
        if match is None:
            # No substitution necessary.
            return unicode.__new__(unicode, original_value)

        obj = unicode.__new__(cls, original_value)
        obj.original_value = original_value
        return obj

    def encode(self, encoding):
        def rewrite(match):
            return match.group(1) + encoding
        return self.CHARSET_RE.sub(rewrite, self.original_value)

class HTMLAwareEntitySubstitution(EntitySubstitution):

    """Entity substitution rules that are aware of some HTML quirks.

    Specifically, the contents of 

"""A generic Formatter for HTML."""
    REGISTRY = {}
    def __init__(self, *args, **kwargs):
        return super(HTMLFormatter, self).__init__(self.HTML, *args, **kwargs)

    
class XMLFormatter(Formatter):
    """A generic Formatter for XML."""
    REGISTRY = {}
    def __init__(self, *args, **kwargs):
        return super(XMLFormatter, self).__init__(self.XML, *args, **kwargs)


# Set up aliases for the default formatters.
HTMLFormatter.REGISTRY['html'] = HTMLFormatter(
    entity_substitution=EntitySubstitution.substitute_html
)
HTMLFormatter.REGISTRY["html5"] = HTMLFormatter(
    entity_substitution=EntitySubstitution.substitute_html,
    void_element_close_prefix = None
)
HTMLFormatter.REGISTRY["minimal"] = HTMLFormatter(
    entity_substitution=EntitySubstitution.substitute_xml
)
HTMLFormatter.REGISTRY[None] = HTMLFormatter(
    entity_substitution=None
)
XMLFormatter.REGISTRY["html"] =  XMLFormatter(
    entity_substitution=EntitySubstitution.substitute_html
)
XMLFormatter.REGISTRY["minimal"] = XMLFormatter(
    entity_substitution=EntitySubstitution.substitute_xml

def __new__(cls, original_value):
        match = cls.CHARSET_RE.search(original_value)
        if match is None:
            # No substitution necessary.
            return unicode.__new__(unicode, original_value)

        obj = unicode.__new__(cls, original_value)
        obj.original_value = original_value
        return obj

    def encode(self, encoding):
        def rewrite(match):
            return match.group(1) + encoding
        return self.CHARSET_RE.sub(rewrite, self.original_value)

class HTMLAwareEntitySubstitution(EntitySubstitution):

    """Entity substitution rules that are aware of some HTML quirks.

    Specifically, the contents of 

def _formatter_for_name(self, name):
        "Look up a formatter function based on its name and the tree."
        if self._is_xml:
            return self.XML_FORMATTERS.get(
                name, EntitySubstitution.substitute_xml)
        else:
            return self.HTML_FORMATTERS.get(
                name, HTMLAwareEntitySubstitution.substitute_xml)

    @classmethod
    def substitute_html(cls, ns):
        return cls._substitute_if_appropriate(
            ns, EntitySubstitution.substitute_html)

if val is None:
                    decoded = key
                else:
                    if isinstance(val, list) or isinstance(val, tuple):
                        val = ' '.join(val)
                    elif not isinstance(val, basestring):
                        val = unicode(val)
                    elif (
                        isinstance(val, AttributeValueWithCharsetSubstitution)
                        and eventual_encoding is not None):
                        val = val.encode(eventual_encoding)

                    text = self.format_string(val, formatter)
                    decoded = (
                        unicode(key) + '='
                        + EntitySubstitution.quoted_attribute_value(text))
                attrs.append(decoded)
        close = ''
        closeTag = ''

        prefix = ''
        if self.prefix:
            prefix = self.prefix + ":"

        if self.is_empty_element:
            close = ''
            if isinstance(formatter, Formatter):
                close = formatter.void_element_close_prefix or close
        else:
            closeTag = '' % (prefix, self.name)

        pretty_print = self._should_pretty_print(indent_level)

def substitute(self, *args, **kwargs):
        return EntitySubstitution.substitute_xml(*args, **kwargs)