template renderer renders properties strangely

[granders]

Refactoring a field into a property can lead to surprising results when rendering

class C(TemplateRenderer):
  x = 2

class D(TemplateRenderer):
  @property
  def x(self):
    return 2

c = C()
d = D()
c.render_template("{{x}}")  # "2"
d.render_template("{[x}}")  # "<property ob... 0x101300e68>"

Cause: @propertys show up in the class dict as a property object, but not in the instance dict, and TemplateRenderer uses these dicts when rendering. So the computed property value isn't visible to the render method.

[ewencp]

There's probably a good solution to this somewhere in Jinja itself -- I'd dig around in their code (or example code) to see if there's a better approach for passing a full object as the context but also providing overrides/extensions via extra parameters to the render method.