Ahh, I was wondering about why it didn't show the error message on the first
variable. Makes sense, thanks again.
Sent from my iPhone
On Apr 27, 2011, at 5:05 PM, Alan Gauld <alan.ga...@btinternet.com> wrote:
>
> "Johnson Tran" <aznj...@me.com> wrote
>> Okay so my final program is:
>
> It works but you can improve it slightly with a simple change.
>
>> model=raw_input("What kind of car do you drive?")
>> gallons=raw_input("How many gallons have you driven?")
>> miles=raw_input("How many miles have you driven?")
>> try:
>> number1 = float(gallons)
>> number2 = float(miles)
>
> Combine these two groups of lines so that you detect the errors as soon as
> possible.:
>
> try:
> model=raw_input("What kind of car do you drive?")
> gallons=raw_input("How many gallons have you driven?")
> number1 = float(gallons)
> miles=raw_input("How many miles have you driven?")
> number2 = float(miles)
>
> Now the user gets prompted as soon as they enter a wrong number, they don't
> need to guess which one was wrong...
>
> except ValueError:
> print "That value is the wrong type, please use a number."
>
> And so we can make the message more specific too.
>
>> else:
>> print "Your average number of miles to gallons is",
>> print number1 / number2
>
> HTH,
>
> --
> Alan Gauld
> Author of the Learn to Program web site
> http://www.alan-g.me.uk/
>
>
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