I am assuming your using Tkinter. To get text from the Entry widget, use it's "get" method.
entry_widget = Entry(some_parent_frame)
entry_widget.pack(side=RIGHT)
....
my_text = entry_widget.get()
In a nutshell. You will need to know the parent frame, which could be root, or another widget. You might have some other formatting thrown in as well, but you should get the point.