python - Access django context variable from parent template -

I can not set any Django template variables from inside children, what's wrong with any idea?

/ P>

   
 main.html:  
  {{extended "base.html"}}   
 details.html:  
  {{extends "main.html"}}   
 this is not working help?   
 
 
 You can not return a single word from a view to a view  HttpResponse  Return to item instead of try:  
 Django 1.3+  
  return render (request, 'main.html', {'header_title': 'my text' })  <   return to render_to_response ('main.html', {'header_title': 'my_text'}, context_instance = RequestContext (requested))