<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def render_context_with_title(self, context):
 """Render a page title and insert it into the context. This function takes in a context dict and uses it to render the page_title variable. It then appends this title to the context using the 'page_title' key. If there is already a page_title key defined in context received then this function will do nothing. """


        if "page_title" not in context:
            con = template.Context(context)
            # NOTE(sambetts): Use force_text to ensure lazy translations
            # are handled correctly.
            temp = template.Template(encoding.force_text(self.page_title))
            context["page_title"] = temp.render(con)
        return context