code: def get_app_template(name):
      
      app_name, template_name = name.split(':')
      return get_lookups()[app_name].get_template(template_name)
docs: Getter function of templates for each applications.
  
      Argument `name` will be interpreted as colon separated, the left value
      means application name, right value means a template name.
  
          get_app_template('blog:dashboarb.mako')
  
      It will return a template for dashboard page of `blog` application.