autocomplete Framework & CMS based [Project basis] | may be as plugin

For example when I work with Ruby on Rails or Laravel PHP framework or Joomla CMS or WP, they have many methods, classes, functions..It would be great to have the auto-complete option. For example i type the class name Base:: then it should display a lists of the variables and methods of that class.

Kindly Refer to: http://www.microsoft.com/Web/webmatrix/developer.aspx

AUTO COMPLETION AND TYPE THROUGH

I need it bad. Then it would have no issues remain to be the most awesome editor. Though already most awesome but I really miss this feature. When works with Eclipse or Dreamweaver, they provide nice elegant auto-complete feature

I don't know it may be difficult. Then may be developed as plugin. I'm sorry, If i can, then  i would have develop. But i don't know Python