WTForm with bootstrap

wt_form_bootstrap.html

{% for field in form %}
    <div class="form-group {{funcs["yesno"](field.errors,"has-error")}}">
        <label for="{{field.label.field_id}}"  class="col-sm-2 control-label">{{field.label.text}}</label>
         <div class="col-sm-10">
            {% raw field(class_="form-control") %}
            {% if field.description %}
                <span class="help-block">{{ field.description}}</span>
            {% end %}
            {% if field.errors %}
                <span class="help-block">
                    {% for err in field.errors %}
                        {{err}}
                    {% end %}
                </span>
            {% end %}
        </div>
    </div>
{% end %}