django template - parse variable inside string variable
vars['current_city'] = "London"
vars['content'] = 'the current city is: {{current_city}}'  #this string comes from db
return render_template(request, 'about_me.html',vars)

{{content}}

from django.template import Template, Context
...
context = {
    'current_city': 'London'
}
db_template = Template('the current city is: {{current_city}}') # get from db
context['content'] = db_template.render(Context(context))
return render_template(request, 'about_me.html', context)

simple_cache = {}

def fooview(request):
    context = {
        'current_city': 'London'
    }
    db_template_string = 'the current city is: {{current_city}}'
    if simple_cache.has_key(db_template_string):
        db_template = simple_cache.get(db_template_string)
    else:
        simple_cache[db_template_string] = Template(db_template_string)
    context['content'] = db_template.render(Context(context))
    return render_template(request, 'about_me.html', context)