\t characters in twig output

anyone knows how to make twig stop outputting \t and \n characters? my output looks like this:

<ul>\n \t\t\t\t\t\t\t\t\t<li>\n\t\t\t\t\t\t\t\t\t<a href=''> ...

for this template:

开发者_StackOverflow社区    <ul>
        {% for datum in this.data %}
        <li><a href='#'>link</a></li>
        {% endfor %}
    </ul>

thanks!

That's right, as it says in the Twig manual for whitespaces:

Whitespace is not further modified by the template engine, so each whitespace (spaces, tabs, newlines etc.) is returned unchanged.

You can use the spaceless-tag to suppress whitespaces.

{% spaceless %}
    <div>
        <strong>foo</strong>
    </div>
{% endspaceless %}

{# output will be <div><strong>foo</strong></div> #}

Have a look at the manual for further options.