Page 346 -

exceptions and message boxes

Your Programming Toolbox

You’ve got Chapter 8.5 under
your belt. Let’s look back at what
you’ve learned in this chapter: CHAPTER 8.5

Programming T ools
* Some errors don't crash your program - they

throw exceptions instead.
* You can run code when there's an exception -
this is called “catching the exception.”
* Code that runs because of an exception is
Python T ools
called an exception handler.
* GUI message boxes display information and ask
block.
* Message boxes are also known as “dialog boxes.”
* You can catch exceptions by using a try/except
questions. * “except Exception as ex" will assign the exception

* Message boxes require the user to respond, even message to a variable called “ex".
if it is just to click an OK button.
formatting it as a string.
* You can display the exception error message by

“tkinter.messagebox” module.
* T o display message boxes, you need to import the
called “show...()".
* Message boxes that display information are all

“ask...()".
* Message boxes that ask questions are all called
Yes, or Retry.
* Message boxes return True if the response was OK,

* Message boxes return False if the response was No.
Cancel.
* Message boxes return None if the response was

you are here 4 311