@@ -541,31 +541,35 @@ the variable, with no further intervention on your part.
541541
542542For example::
543543
544- class App(Frame):
545- def __init__(self, master=None):
544+ import tkinter as tk
545+
546+ class App(tk.Frame):
547+ def __init__(self, master):
546548 super().__init__(master)
547549 self.pack()
548550
549- self.entrythingy = Entry()
551+ self.entrythingy = tk. Entry()
550552 self.entrythingy.pack()
551553
552- # here is the application variable
553- self.contents = StringVar()
554- # set it to some value
554+ # Create the application variable.
555+ self.contents = tk. StringVar()
556+ # Set it to some value.
555557 self.contents.set("this is a variable")
556- # tell the entry widget to watch this variable
558+ # Tell the entry widget to watch this variable.
557559 self.entrythingy["textvariable"] = self.contents
558560
559- # and here we get a callback when the user hits return.
560- # we will have the program print out the value of the
561- # application variable when the user hits return
561+ # Define a callback for when the user hits return.
562+ # It prints the current value of the variable.
562563 self.entrythingy.bind('<Key-Return>',
563- self.print_contents)
564+ self.print_contents)
564565
565566 def print_contents(self, event):
566- print("hi. contents of entry is now ----> ",
567+ print("Hi. The current entry content is: ",
567568 self.contents.get())
568569
570+ root = tk.Tk()
571+ myapp = App(root)
572+ myapp.mainloop()
569573
570574The Window Manager
571575^^^^^^^^^^^^^^^^^^
@@ -860,4 +864,4 @@ use raw reads or ``os.read(file.fileno(), maxbytecount)``.
860864 WRITABLE
861865 EXCEPTION
862866
863- Constants used in the *mask * arguments.
867+ Constants used in the *mask * arguments.
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