Re: [Tutor] variable * raw_input
Dewight Kramer wrote:
> Hello,
>
> So i am new to Python, and really to programming. I picked up book
> and so far I like it. right now I am trying to figure out a problem
> that I cant.
>
> It is a tipping program and I have assigned certain words to be a
> certain % and then I ask the user to type raw input of one of those
> names. After which I am trying to mutiply the Bill by the Service
> quality. But I dont understand something below is code.
>
> Thanks
> D
>
> # Tip Calulator - Ver
> # Challenges Ch2 - Question 3
> # Developed by, Dewight
> # Developed on, 8/7/2007
>
>
> # establish variables
> bill = float(0.0)
> bad = float (0.0)
> ok = float(0.10)
> good = float (0.15)
> great = float (0.20)
>
Speaking as a former waiter, this should probably read:
great = float (0.25)
good = float (0.20)
ok = float(0.15)
bad = float (0.10)
eatathomeyoucheapskatebagofcrap = float(0.0)
;-)
I now return you to your regularly scheduled Python discussion.
> service="nothing"
> tip = float ()
> total = float ()
>
> print "This is a tipping calculator."
>
> bill = raw_input ("\nWhat was the total bill amount? ")
> service = raw_input("Please input one of the following to"+
> " discribe the service:"+"\nbad\nok\ngood\ngreat
> \n")
>
> tip = bill * service
> total = bill + tip
> print "Then you should leave a" + tip + "tip. This will bring the
> total to" + total +"."
>
>
> raw_input("\n\nPlease press enter to exit.")
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>
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Re: [Tutor] variable * raw_input
"Dewight Kramer" <[EMAIL PROTECTED]> wrote
> quality. But I dont understand something below is code.
Since you don't tell us what exactly you don't undertand
I'll make some general comments on the code...
> # establish variables
> bill = float(0.0)
> bad = float (0.0)
> ok = float(0.10)
> good = float (0.15)
> great = float (0.20)
You don;t need the float() call because the values are
already floats by dint of having a decimal point in them.
float is really for converting non float values(integer or string)
to floats.
> service="nothing"
> tip = float ()
> total = float ()
these lsat two will be the same as
tip = 0.0
total = 0.0
> print "This is a tipping calculator."
>
> bill = raw_input ("\nWhat was the total bill amount? ")
raw_input returns a string, you probably want to convert that to
a float, so here you do want to use float(), like so:
> bill = float(raw_input ("\nWhat was the total bill amount? "))
> service = raw_input("Please input one of the following to"+
> " describe the service:"+"\nbad\nok\ngood\ngreat
> \n")
You could use a triple quoted string here for clearer layout:
service = raw_input(
"""Please input one of the following to describe the service:
bad
ok
good
great
""")
> tip = bill * service
But now you are trying to multiply a number(bill) by a string ('ok',
'bad' etc)
Thsat won;t work, instead you need to convert the string into some
kind
of number. The common way to do that would be using a dictionary:
serviceVal = {'bad': 0, 'ok': 0.1, 'good': 0.15, 'great':0.2}
and now the tip line looks like:
tip = bill * serviceVal[service]
> total = bill + tip
> print "Then you should leave a" + tip + "tip. This will bring the
> total to" + total +"."
You might find this easier using string formatting
print "Then you should leave a $%.2f tip. This will bring the total to
$%.2f." % (tip, total)
Notice how that lets you control what the output looks like
more precisely.
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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[Tutor] variable * raw_input
Hello,
So i am new to Python, and really to programming. I picked up book
and so far I like it. right now I am trying to figure out a problem
that I cant.
It is a tipping program and I have assigned certain words to be a
certain % and then I ask the user to type raw input of one of those
names. After which I am trying to mutiply the Bill by the Service
quality. But I dont understand something below is code.
Thanks
D
# Tip Calulator - Ver
# Challenges Ch2 - Question 3
# Developed by, Dewight
# Developed on, 8/7/2007
# establish variables
bill = float(0.0)
bad = float (0.0)
ok = float(0.10)
good = float (0.15)
great = float (0.20)
service="nothing"
tip = float ()
total = float ()
print "This is a tipping calculator."
bill = raw_input ("\nWhat was the total bill amount? ")
service = raw_input("Please input one of the following to"+
" discribe the service:"+"\nbad\nok\ngood\ngreat
\n")
tip = bill * service
total = bill + tip
print "Then you should leave a" + tip + "tip. This will bring the
total to" + total +"."
raw_input("\n\nPlease press enter to exit.")
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