Brian - thanks for your continuing help! Here is ALL of the code. Sure hope you can help. Cheers. Diana
Hi Diana,
whew! A bit of an adventure, but I think I've got it. (The adventure comes in as I have used Tkinter about twice. I've done almost no GUI programming; most of it has been in playing with the Pythoncard tutorials and demos. :-)
I've snipped away all but the relevant code.
def reveal(self): """ Display message based on number. Changing text widget to integer Correcting the entry of a string variable - except the error checking isn't working!"""
try: self.guess = int(self.num_ent.get())
except(ValueError),e:
Here, I put in a line:
print "I'm in the except block!" # XXX
This made the message print in the interactive window. (I ran this through PythonWin, so had the PythonWin interactive window visible underneath your app.) That confirms that the exception is being raised and caught as desired. So, it must be that there is something faulty in how you are constructing the message.
For future reference, a few print statements sprinkled about are worth a lot of debugging time! I like to append mine with # XXX so I can quickly find them when it comes time to extract them.
A false start later, I worked it out as below.
message = "%s is not a number. Please try again!" %self.guess
else: self.num_ent.delete(0,END) self.num_ent.focus_set()
if self.guess < self.number: message = "%s is too low! You need to guess higher. " %self.guess
if self.guess > self.number: message = "%s is too high! You need to guess lower." %self.guess
if self.guess == self.number: message = "%s is the correct number!" %self.guess
self.message_txt.config(state = NORMAL) self.message_txt.config(state = DISABLED)
Here's the problem. I don't know the relevant lingo, but this is the chunk of code which makes the message display in your widget. *But* it is in your else clause in the try/except/else construct. So, if an exception is raised, it isn't run. Outdent it so that it is hit irrespective of the flow going through the except or the else, and all is golden!
self.message_txt.config(state = NORMAL)
self.message_txt.delete(0.0, END)
self.message_txt.insert(0.0, message)
self.message_txt.config(state = DISABLED)
HTH,
Brian vdB
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