[Django]-How to get the filename and line number of a Django template error when calling render()?

I believe that source attribute of the TemplateSyntaxError is what you are looking for. Django code implies that the mentioned numbers are line numbers between which an error occured, see https://github.com/django/django/blob/1.3.7/django/views/debug.py#L153.

As for TemplateDoesNotExist, it seems to be ignored, when it occurs as a result of the template tag, see https://github.com/django/django/blob/1.3.7/django/template/loader.py#L50.