How to use the mako.compat function in Mako

@contextlib.contextmanager
def raises(except_cls, message=None):
    try:
        yield
        success = False
    except except_cls as e:
        if message:
            assert re.search(
                message, compat.text_type(e), re.UNICODE
            ), "%r !~ %s" % (message, e)
            print(compat.text_type(e).encode("utf-8"))
        success = True

    # assert outside the block so it works for AssertionError too !
    assert success, "Callable did not raise an exception"

def test_parse_python_expression(self):
        input_ = io.BytesIO(compat.b('<p>${_("Message")}</p>'))
        messages = list(extract(input_, ["_"], [], {}))
        self.assertEqual(messages, [(1, "_", compat.u("Message"), [])])

def __init__(self, buffer, **data):
        self._buffer_stack = [buffer]

        self._data = data

        self._kwargs = data.copy()
        self._with_template = None
        self._outputting_as_unicode = None
        self.namespaces = {}

        # "capture" function which proxies to the
        # generic "capture" function
        self._data['capture'] = compat.partial(capture, self)

        # "caller" stack used by def calls with content
        self.caller_stack = self._data['caller'] = CallerStack()

def _compile_module_file(template, text, filename, outputpath, module_writer):
    source, lexer = _compile(
        template, text, filename, generate_magic_comment=True
    )

    if isinstance(source, compat.text_type):
        source = source.encode(lexer.encoding or "ascii")

    if module_writer:
        module_writer(source, outputpath)
    else:
        # make tempfiles in the same location as the ultimate
        # location.   this ensures they're on the same filesystem,
        # avoiding synchronization issues.
        (dest, name) = tempfile.mkstemp(dir=os.path.dirname(outputpath))

        os.write(dest, source)
        os.close(dest)
        shutil.move(name, outputpath)

def escape_entities(self, text):
        """Replace characters with their character entity references.

        Only characters corresponding to a named entity are replaced.
        """
        return compat.text_type(text).translate(self.codepoint2entity)

translator_comments = []

            translator_strings = [
                comment[1] for comment in translator_comments
            ]

            if isinstance(code, compat.text_type):
                code = code.encode(input_encoding, "backslashreplace")

            used_translator_comments = False
            # We add extra newline to work around a pybabel bug
            # (see python-babel/babel#274, parse_encoding dies if the first
            # input string of the input is non-ascii)
            # Also, because we added it, we have to subtract one from
            # node.lineno
            code = compat.byte_buffer(compat.b("\n") + code)

            for message in self.process_python(
                code, node.lineno - 1, translator_strings
            ):
                yield message
                used_translator_comments = True

            if used_translator_comments:
                translator_comments = []
            in_translator_comments = False

            if child_nodes:
                for extracted in self.extract_nodes(child_nodes):
                    yield extracted

attributes, **kwargs)

        try:
            cls = _TagMeta._classmap[keyword]
        except KeyError:
            raise exceptions.CompileException(
                "No such tag: '%s'" % keyword,
                source=kwargs['source'],
                lineno=kwargs['lineno'],
                pos=kwargs['pos'],
                filename=kwargs['filename']
            )
        return type.__call__(cls, keyword, attributes, **kwargs)


class Tag(compat.with_metaclass(_TagMeta, Node)):

    """abstract base class for tags.

    <%sometag/>

    <%someothertag>
        stuff
    

    """
    __keyword__ = None

    def __init__(self, keyword, attributes, expressions,
                 nonexpressions, required, **kwargs):
        """construct a new Tag instance.

for filename, lineno, function, line in rawrecords:
            if not line:
                line = ""
            try:
                (line_map, template_lines, template_filename) = mods[filename]
            except KeyError:
                try:
                    info = mako.template._get_module_info(filename)
                    module_source = info.code
                    template_source = info.source
                    template_filename = (
                        info.template_filename or info.template_uri or filename
                    )
                except KeyError:
                    # A normal .py file (not a Template)
                    if not compat.py3k:
                        try:
                            fp = open(filename, "rb")
                            encoding = util.parse_encoding(fp)
                            fp.close()
                        except IOError:
                            encoding = None
                        if encoding:
                            line = line.decode(encoding)
                        else:
                            line = line.decode("ascii", "replace")
                    new_trcback.append(
                        (
                            filename,
                            lineno,
                            function,
                            line,

self,
                    data,
                    filename,
                    path,
                    self.module_writer)
            module = compat.load_module(self.module_id, path)
            del sys.modules[self.module_id]
            if module._magic_number != codegen.MAGIC_NUMBER:
                data = util.read_file(filename)
                _compile_module_file(
                    self,
                    data,
                    filename,
                    path,
                    self.module_writer)
                module = compat.load_module(self.module_id, path)
                del sys.modules[self.module_id]
            ModuleInfo(module, path, self, filename, None, None)
        else:
            # template filename and no module directory, compile code
            # in memory
            data = util.read_file(filename)
            code, module = _compile_text(
                self,
                data,
                filename)
            self._source = None
            self._code = code
            ModuleInfo(module, None, self, filename, code, None)
        return module

def decode(x):
            if isinstance(x, compat.text_type):
                return x
            elif not isinstance(x, compat.binary_type):
                return decode(str(x))
            else:
                return compat.text_type(x, encoding=key)