How to use the spyder.py3compat.to_text_string function in spyder

def listdir(path, include='.', exclude=r'\.pyc$|^\.', show_all=False,
            folders_only=False):
    """List files and directories"""
    namelist = []
    dirlist = [to_text_string(osp.pardir)]
    for item in os.listdir(to_text_string(path)):
        if re.search(exclude, item) and not show_all:
            continue
        if osp.isdir(osp.join(path, item)):
            dirlist.append(item)
        elif folders_only:
            continue
        elif re.search(include, item) or show_all:
            namelist.append(item)
    return sorted(dirlist, key=str_lower) + \
           sorted(namelist, key=str_lower)

def get_tab_tip(self, filename, is_modified=None, is_readonly=None):
        """Return tab menu title"""
        text = u"%s — %s"
        text = self.__modified_readonly_title(text,
                                              is_modified, is_readonly)
        if self.tempfile_path is not None\
           and filename == encoding.to_unicode_from_fs(self.tempfile_path):
            temp_file_str = to_text_string(_("Temporary file"))
            return text % (temp_file_str, self.tempfile_path)
        else:
            return text % (osp.basename(filename), osp.dirname(filename))

def silent_execute(self, code):
        """Execute code in the kernel without increasing the prompt"""
        try:
            self.kernel_client.execute(to_text_string(code), silent=True)
        except AttributeError:
            pass

if self.re_button.isChecked():
            try:
                re_pattern = re.compile(search_text, flags=re_flags)
                # Check if replace_text can be substituted in re_pattern
                # Fixes spyder-ide/spyder#7177.
                re_pattern.sub(replace_text, '')
            except re.error:
                # Do nothing with an invalid regexp
                return

        first = True
        cursor = None
        while True:
            if first:
                # First found
                seltxt = to_text_string(self.editor.get_selected_text())
                cmptxt1 = search_text if case else search_text.lower()
                cmptxt2 = seltxt if case else seltxt.lower()
                if re_pattern is None:
                    has_selected = self.editor.has_selected_text()
                    if has_selected and cmptxt1 == cmptxt2:
                        # Text was already found, do nothing
                        pass
                    else:
                        if not self.find(changed=False, forward=True,
                                         rehighlight=False):
                            break
                else:
                    if len(re_pattern.findall(cmptxt2)) > 0:
                        pass
                    else:
                        if not self.find(changed=False, forward=True,

def open_file(self, fname, external=False):
        """
        Open filename with the appropriate application
        Redirect to the right widget (txt -> editor, spydata -> workspace, ...)
        or open file outside Spyder (if extension is not supported)
        """
        fname = to_text_string(fname)
        ext = osp.splitext(fname)[1]
        if encoding.is_text_file(fname):
            self.editor.load(fname)
        elif self.variableexplorer is not None and ext in IMPORT_EXT:
            self.variableexplorer.import_data(fname)
        elif not external:
            fname = file_uri(fname)
            programs.start_file(fname)

if i_rate > 0:
            i_rate_end = self.output.find('/10', i_rate)
            if i_rate_end > 0:
                rate = self.output[i_rate+len(txt_rate):i_rate_end]

        # Previous run
        previous = ''
        if rate is not None:
            txt_prun = 'previous run: '
            i_prun = self.output.find(txt_prun, i_rate_end)
            if i_prun > 0:
                i_prun_end = self.output.find('/10', i_prun)
                previous = self.output[i_prun+len(txt_prun):i_prun_end]


        filename = to_text_string(self.filecombo.currentText())
        self.set_data(filename, (time.localtime(), rate, previous, results))
        self.output = self.error_output + self.output
        self.show_data(justanalyzed=True)

def get_filename(self, index):
        """Return filename associated with *index*"""
        if index:
            return osp.normpath(to_text_string(self.fsmodel.filePath(index)))

cursor.endEditBlock()
            self.setTextCursor(cursor)
            self.__restore_selection(start_pos, end_pos)
            return

        cursor.setPosition(end_pos, QTextCursor.KeepAnchor)
        if last_line and after_current_line:
            # Stop if selection is already at end of the file while moving down
            cursor.endEditBlock()
            self.setTextCursor(cursor)
            self.__restore_selection(start_pos, end_pos)
            return

        # ------ Move text

        sel_text = to_text_string(cursor.selectedText())
        cursor.removeSelectedText()


        if after_current_line:
            # Shift selection down
            text = to_text_string(cursor.block().text())
            sel_text = os.linesep + sel_text[0:-1]  # Move linesep at the start
            cursor.movePosition(QTextCursor.EndOfBlock)
            start_pos += len(text)+1
            end_pos += len(text)
            if not cursor.atEnd():
                end_pos += 1
        else:
            # Shift selection up
            if last_line:
                # Remove the last linesep and add it to the selected text

def __in_block_comment(cursor):
            cs = self.comment_string
            return to_text_string(cursor.block().text()).startswith(cs)
        # Finding second comment bar