"Johnson Tran" <aznj...@me.com> wrote
Thanks for the reply Alan and Noah, I really appreciate
the help. I am really trying to understand this although
still cannot seem to grasp it all.
Lets step back a stage.
Do you understand what float() does?
I have modified my program although now it seems
to be giving me the wrong answer with the correct
answer when I input any value.
model=raw_input("What kind of car do you drive?")
gallons=raw_input("How many gallons have you driven?")
number1 = float (gallons)
This is taking the value typede by the user and trying
to convert it from a string to a floating point number - that is,
a decimal value
miles=raw_input("How many miles have you driven?")
number2 = float (miles)
Similarly this converts the input string to a decimal value,
if possible.
try:
model=float(model)
But what is this doing?
It is trying to convert the model of car to a decimal value.
Unless trhe car is a Porche 911 or similar its unlikely
to succeed! If its a Toyota Prius it will fail with a ValueError
exception.
except ValueError:
print "I cannot compute your total miles to gallon with those
values."
And therefore print this message
else:
print "Your average number of miles to gallons is",
print number1 / number2
The second print needs to be inside the else too.
What kind of car do you drive?fire
How many gallons have you driven?10
How many miles have you driven?5
I cannot compute your total miles to gallon with those values.
Because it cannot convert 'fire' to a decimal value.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
