# [Tutor] (no subject)

Gregor Lingl glingl@aon.at
Tue, 25 Dec 2001 09:39:09 +0100

```----- Original Message -----
From: "Kirk Bailey" <deliberatus@my995internet.com>
To: "Iain Long" <ilflexi2@hotmail.com>
Cc: <tutor@python.org>
Sent: Tuesday, December 25, 2001 12:12 AM
Subject: Re: [Tutor] (no subject)

Unfortunately there are several flaws
concerning sytax as well as logic
in the code below, so it will not work:

> WEll, try this:
>
> def square(x)
> x*x

1. firsdt line needs an ":" at the end
2. second line has to be idented
3. This line will return  the special object
None instead of the desired square of x
Therefore the codeline in areacircle
will raise an error

def square(x):
return x*x

>
> Then, try this:
>
> pi = 3.1415926

This is ok, but
Remark: instead of this you could also write

from math import pi

(just in case you cannot remember the desired
number of decimals of pi)
>
>
> def areacircle(x)
> return pi * square(x)
>

Again:
1. add ":" in the  def-line
2. indent second line

def areacircle(x):
return pi * square(x)

> then, after you type those in, try this:
>
> # That input will BOMB if you input anything but a number!
> print areacircle(R)
>
> Try it. Are we having fun yet?
>
>
>
> Iain Long wrote:
> >
> > I was reading about instant hacking so i clicked the windows icon and
run
> > and typed in notepad... and did an example that was shown...
> >
> >    print radius*radius*3.14 .... i don't know what to do next
> >

I suppose, Iain, your problem is another one:
You want to know how to execute those two statements above.
It does not suffice to type it into an editor.
You may use either of two ways:

In any case you have to have installed you Python-interpreter. (You can
get it from http://www.python.org)

1. way:
-------
If you start it, you will see a prompt:

>>>

There you can input Python statements

>>>

(If you doubt, that this changes something in your computer,
you may type:

30
>>>

So this value 30 is stored in a variable called radius)

Then continue:

2826.0

... prints the interpreter

2. way:
-------

Youo save, what you typed into notepad as a Python-script,
for instance as circle.py

open the MSDOS-prompt (or a terminal, a shell or whatever if you
doesn't use Windows) and type

c:\Python21>python circle.py

This will result in displaying

2826.0

Hope that helps
Gregor

_________________________________________________________________
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> >
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> --
> Respectfully,
>              -Kirk D Bailey (C)2001
> end
>
>
> Within the sweep of his sword, Each man is an Ubar.
>
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> http://www.sacredelectron.org/
>
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>

```