code: def render_impl(template_file, ctx=None, paths=None, filters=None):
      
      env = tmpl_env(make_template_paths(template_file, paths))
  
      if env is None:
          return copen(template_file).read()
  
      if filters is not None:
          env.filters.update(filters)
  
      if ctx is None:
          ctx = {}
  
      return env.get_template(os.path.basename(template_file)).render(**ctx)
docs: :param template_file: Absolute or relative path to the template file
      :param ctx: Context dict needed to instantiate templates
      :param filters: Custom filters to add into template engine
      :return: Compiled result (str)