def render(self, template_name, block, **context):
template = self._get_template(template_name)<EOL>return self._render_context(template,<EOL>template.blocks[block],<EOL>**context)<EOL>
TO render a block in the template
:param template_name: the template file name
:param block: the name of the block within {% block $block_name %}
:param context: **kwargs context to render
:returns string: of rendered content