<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def tree_render(request, upy_context, vars_dictionary):
 """ It renders template defined in upy_context's page passed in arguments """

    page = upy_context['PAGE']
    return render_to_response(page.template.file_name, vars_dictionary, context_instance=RequestContext(request))