# [Tutor] trouble with "if"

Andre Engels andreengels at gmail.com
Wed May 23 18:08:20 CEST 2007

The problem is with types. The outcome of raw_input is a string. But
if you give the line:

if shape == 1:

you are comparing it with a number. The text "1" is not equal to the
number 1, so this evaluates to False.

if shape == "1":

To also be able to type 'circle' instead of '1', you can do:

if shape == "1" or shape == "circle":

or alternatively:

if shape in ["1","circle"]:

Andre Engels

>
> Hi all,
>
> I've been working with this new program that I wrote.  I started out with it
> on a Ti-83, which is much easier to program than python.  Now I'm trying to
> transfer the program to python but its proving to be quite difficult.  I'm
> not sure what the whole indentation thing is for.  And now I'm having
> trouble with the if statement things.
>
> #"Circle Data Calculation Program:"
> print "Welcome to the Circle Data Calcuation Program."
> print
>
> print "Pick a shape:"
> print "(NOTE: You must select the number of the shape and not the shape
> itself)"
> print "1 Circle"
> print "2 Square"
> print "3 Triangle"
>
>     #"User's Choice:"
> shape=raw_input("> ")
>
>         #"Select Given:"
> if shape == 1:
>         print "Choose the given value:"
>         print "2 diameter"
>         print "3 circumference"
>         print "4 area"
>
> #"User's Choice:"
> given=raw_input("> ")
>
> if given == 1:
>         circumference=(diameter*3.14)
>         print "Diameter:", diameter
>         print "Circumference:", circumference
>         print "Area:", area
>
> if given == 2:
>         diameter=raw_input("Enter Diameter:")
>         circumference=(diameter*3.14)
>         print "Circumference:", circumference
>         print "Area:", area
>
> if given == 3:
>         circumference=raw_input("Enter Circumference:")
>         print "Diameter:", diameter
>         print "Area:", area
>
> if given == 4:
>         area=raw_input("Enter Area:")
>
> This is the whole program so far, because I haven't quite finished it yet.
> But I tried to get it to display another list of options after you select a
> shape but it just does this.
>
> Pick a shape:
> 1 Circle
> 2 Square
> 3 Triangle
> >1
> >1
> >>>
>
> I'm not sure why it does that but I do know that it is skipping the second
> list of options.
>
> Another of my problems is that I can't figure out how to get it to accept
> two different inputs for a selection.  Like I want it to accept both the
> number 1 and circle as circle then list the options for circle.  It won't
> even accept words.  I can only get it to accept numbers.  It's quite
> frustrating actually.
>
> Any advice would be greatly appreciated.
>
>
>
>
>
> I tried to get it to display ano
>
> ________________________________