{% if "class" in attrs.keys %} {% for name, value in attrs.iteritems %} {{ name }}{% if name == "class" %}="form-control {{ value }}"{% else %}{% if value != True %}="{{ value }}"{% endif %}{% endif %}{% endfor %} {% else %} {% for name, value in attrs.iteritems %} {{ name }}{% if value != True %}="{{ value }}"{% endif %}{% endfor %} class="form-control" {% endif %}