I am new to python and want to learn this from the basic.
I want to open two other application like notepad in a single window. I searched for any examples by using "tkinter". Any idea for implementing this using "tkinter". 
PS: two tabs one in left and one in right so that one tab will be having notepad and other will have a media player (let say) and i should be able to close the single parent window for closing this child windows.
I don't think you will be able to do this easily. Notepad is using its own toolkit which, most probably, is not compatible with the one you are using.
If you want to open eg. an editor, look for a widget in the toolkit of your choice which does what you want (or nearly). Eg. if you want an editor, use the GtkTextView in GTK, or, if you want something that can do code editing, look at GtkSourceView, etc. Same goes for media applications.
The 'include' applications as part of a project works only to a certain point. You can eg, include text-mode applications in a terminal window, but graphical apps are much harder.
Opening other application in single window using python