So, I'm passing an object with a "content" property that contains html.
<div>{{ myobject.content }}</div>
I want to be able to output the content so that the characters are rendered as the html characters.
The contents of "conent" might be: <p>Hello</p>
I want this to be sent to the browser as: &lt;p&gt;Hello&lt;/p>
Is there something I can put in my template to do this automatically?
Yes, {{ myobject.content | escape }}
should help (assuming you mean Django templates -- there's no specific "App Engine" templating system, GAE apps often use the Django templating system); you may need to repeat the | escape
part if you want two levels of escaping (as appears to be the case in some but not all of the example you supply).