human
Complete the below
def formstyle_bootstrap(form, fields, *args, **kwargs):

    ''''Formstyle for Bootstrap 2.x themes: http://getbootstrap.com/2.3.2/'
    '''
 What is a the Python code you requested?
assistant
#Here is the Python code you requested.
    def render_row(id, label, controls, help, hidden=False):
        _help = DIV(help, _class='help-block')
        _controls = DIV(controls, _help, _class='controls')
        _submit = False
        element = None
        if isinstance(controls, INPUT):
            controls.add_class('span4')
            element = controls
        elif hasattr(controls, 'element'):
            element = controls.element('input')
        if element:
            if (element['_type'] == 'submit'):
                _submit = True
                element['_class'] = 'btn    btn-primary'
            elif (element['_type'] == 'file'):
                element['_class'] = 'input-file'
        if (isinstance(controls, CAT) and isinstance(controls[0], INPUT)):
            controls[0].add_class('span4')
        if isinstance(controls, SELECT):
            controls.add_class('span4')
        if isinstance(controls, TEXTAREA):
            controls.add_class('span4')
        if isinstance(label, LABEL):
            label['_class'] = 'control-label'
        _class = ('hide    ' if hidden else '')
        if _submit:
            return DIV(label, controls, _class=('%sform-actions' % _class), _id=id)
            _submit = False
        else:
            return DIV(label, _controls, _class=('%scontrol-group' % _class), _id=id)
    if args:
        row_id = form
        label = fields
        (widget, comment) = args
        if comment:
            comment = DIV(_class='tooltip', _title=('%s|%s' % (label, comment)))
        hidden = kwargs.get('hidden', False)
        return render_row(row_id, label, widget, comment, hidden)
    else:
        form.add_class('form-horizontal')
        parent = FIELDSET()
        for (row_id, label, widget, comment) in fields:
            parent.append(render_row(row_id, label, widget, comment))
        return parent