hello is there a way if a condition is not met to restart the whole program?
for example if and if statement returns true then re start the whole
program?
Tutor maillist - Tutor (AT) python (DOT) org

hello is there a way if a condition is not met to restart the whole
program? for example if and if statement returns true then re start the
whole program?

Question before we go on: why are you trying to do this?

It's possible to do this, but it sounds so unusual that I want to know
more about the problem.

Tutor maillist - Tutor (AT) python (DOT) org

Amadeo Bellotti wrote:
hello is there a way if a condition is not met to restart the whole
program? for example if and if statement returns true then re start
the whole program?

You can probably achieve what you want just by structuring the program
correctly. My guess you need to use nested loops, something like this:

while True:
initialize_everything()
while True:
if something_is_wrong():
break
do_some_work()

This will do_some_work() until something_is_wrong(), then it will
initialize_everything() and try again.

If the test for something_is_wrong() is buried deep in the code you can
break the loop by raising an exception which you catch in the top-level
loop.

Kent

Tutor maillist - Tutor (AT) python (DOT) org

Amadeo Bellotti wrote:
Mr. Johnson i was hoping i didnt have to make my whole program into a
loop because its about 900 lines of code and tabbing that would take a
long time
If your whole program is 900 lines without a subroutine then you have
more problems than just tabbingreally, a program this big should have
many functions to divide up the work. Looking for a workaround for poor
program structure is not a good solution in the long run; fixing the
program structure so it is workable is a better idea.

As a practical matter, many editors allow you to select and indent a
block, including TextPad and Eclipse, the two editors I usually use.

Kent

PS please reply to the list, not to me personally.
>
>
>
8/17/06, *Kent Johnson* <kent37 (AT) tds (DOT) net <mailto:kent37 (AT) tds (DOT) net>
wrote:

Amadeo Bellotti wrote:
hello is there a way if a condition is not met to restart the whole
program? for example if and if statement returns true then re start
the whole program?

You can probably achieve what you want just by structuring the
program
correctly. My guess you need to use nested loops, something like this:

while True:
initialize_everything()
while True:
if something_is_wrong():
break
do_some_work()

This will do_some_work() until something_is_wrong(), then it will
initialize_everything() and try again.

If the test for something_is_wrong() is buried deep in the code
you can
break the loop by raising an exception which you catch in the
top-level
loop.

Kent

Tutor maillist - Tutor (AT) python (DOT) org <mailto:Tutor (AT) python (DOT) org>

<>
--

Tutor maillist - Tutor (AT) python (DOT) org

thank you Mr. Johnson this is my first program so its a little sloppy. I'm
using gedit ill check out the other editors that u have thank you

8/17/06, Kent Johnson <kent37 (AT) tds (DOT) netwrote:

Amadeo Bellotti wrote:
Mr. Johnson i was hoping i didnt have to make my whole program into a
loop because its about 900 lines of code and tabbing that would take a
long time
If your whole program is 900 lines without a subroutine then you have
more problems than just tabbingreally, a program this big should have
many functions to divide up the work. Looking for a workaround for poor
program structure is not a good solution in the long run; fixing the
program structure so it is workable is a better idea.

As a practical matter, many editors allow you to select and indent a
block, including TextPad and Eclipse, the two editors I usually use.

Kent

PS please reply to the list, not to me personally.
>
>
>
8/17/06, *Kent Johnson* <kent37 (AT) tds (DOT) net <mailto:kent37 (AT) tds (DOT) net>>
wrote:

Amadeo Bellotti wrote:
hello is there a way if a condition is not met to restart the
whole
program? for example if and if statement returns true then re
start
the whole program?

You can probably achieve what you want just by structuring the
program
correctly. My guess you need to use nested loops, something like
this:

while True:
initialize_everything()
while True:
if something_is_wrong():
break
do_some_work()

This will do_some_work() until something_is_wrong(), then it will
initialize_everything() and try again.

If the test for something_is_wrong() is buried deep in the code
you can
break the loop by raising an exception which you catch in the
top-level
loop.

Kent

Tutor maillist - Tutor (AT) python (DOT) org <mailto:Tutor (AT) python (DOT) org>

<>
>
>
>
>

Tutor maillist - Tutor (AT) python (DOT) org

Tutor maillist - Tutor (AT) python (DOT) org

thank you Mr. Johnson this is my first program so its a little sloppy. I'm
using gedit ill check out the other editors that u have thank you

More fundamentally, spend some time to learn about functions; they'll
address much of the original concerns you had. See any of the tutorials
on:

and almost all of them should talk about what functions are, and how to
use them.

Best of wishes!

Tutor maillist - Tutor (AT) python (DOT) org

Thank you again i no im a newbie and really inexperianced but thank you

8/17/06, Danny Yoo <dyoo (AT) hkn (DOT) eecs.berkeley.eduwrote:

thank you Mr. Johnson this is my first program so its a little sloppy.
I'm
using gedit ill check out the other editors that u have thank you

More fundamentally, spend some time to learn about functions; they'll
address much of the original concerns you had. See any of the tutorials
on:

and almost all of them should talk about what functions are, and how to
use them.

Best of wishes!

Tutor maillist - Tutor (AT) python (DOT) org

thank you Mr. Johnson this is my first program so its a little
sloppy. I'm
using gedit ill check out the other editors that u have thank you

If you have Python you will have either IDLE or Pythonwin (or both)
Both of these will allow block indent/unindent so simply load the
code into IDLE to do the indentation You can go back to gedit
afterwards if you like.

But as Kent said you should ideally aimto write the code as
functions, each about 5-50 lines long (less than 5 and the advantage
is minimal, mor than 50 is just too long - around 12 lines per
functoion
is a good average IMH

But don't use number of lines as the deciding factor! Divide the code
into blocks of code that do something logical that you can describe
in a few words (see the comments from Danny to Kermit for examples!)
Use those few words to name the function. Consider how to pass key
data between the funbctions using parameters and return values.

If you don't know how to write functions take a look at the Functions
topic of my tutor.

HTH,

Alan Gauld
Author of the Learn to Program web site

Tutor maillist - Tutor (AT) python (DOT) org

thank you but IDLE doesnt seem to work on Suse 9.2 do you know a way to fix
it?

8/17/06, Alan Gauld <alan.gauld (AT) freenet (DOT) co.ukwrote:

thank you Mr. Johnson this is my first program so its a little
sloppy. I'm
using gedit ill check out the other editors that u have thank you

If you have Python you will have either IDLE or Pythonwin (or both)
Both of these will allow block indent/unindent so simply load the
code into IDLE to do the indentation You can go back to gedit
afterwards if you like.

But as Kent said you should ideally aimto write the code as
functions, each about 5-50 lines long (less than 5 and the advantage
is minimal, mor than 50 is just too long - around 12 lines per
functoion
is a good average IMH

But don't use number of lines as the deciding factor! Divide the code
into blocks of code that do something logical that you can describe
in a few words (see the comments from Danny to Kermit for examples!)
Use those few words to name the function. Consider how to pass key
data between the funbctions using parameters and return values.

If you don't know how to write functions take a look at the Functions
topic of my tutor.

HTH,

Alan Gauld
Author of the Learn to Program web site

--

Tutor maillist - Tutor (AT) python (DOT) org

thank you but IDLE doesnt seem to work on Suse 9.2 do you know a way
to fix
it?

I've only used IDLE on Linux a few times but it certainly works
on RedHat, Mandriva and Slackware. And it used to work on
Suse 5 - the only time I ever used Suse

What hapens when you try to run IDLE? It may just be a case of
fixing a path setting or somesuch.

Alan G.

Tutor maillist - Tutor (AT) python (DOT) org

Mr. Kuhlman it says python is not configured for tk.

Gaarrgh! Why do linux distros do this? Stooopid

You will need to fetch another version of Python with
Tk support built in. Its a compile time option so you can
either fetch the source an build it yourself or find a Suse
package with Tk support already selected.

Its really stupid for Suse to do that, it only saves a tiny
amount of space and means you can't run any programs
based on Tkinter

but on another note does anyone know how to make a 2d array?

This should probably be a separate post.

Also can you change the subject line in your posts so people
can fiind the thread easily. I've changed it on this one to pick
up the 2D array issue

A 2D array is just a table. There are several ways to do that
in Python but the easiest is just a list of lists: Think of a chess
game as an example where the boars is represented by
an 8x8 2D array:

chessBoard = [
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0]
]

Now you can access the third row, 4th column with:

chessBoard[2][3] # remember zero indexing!

Is that clear?

You can also use tuples similarly, or nested dictionaries.
A lot will depend on the data you are storing and how you
want to access it.

Finally you can create a Class with bespoke methods to
more closely model your problem, but the class will usaually
have one of the above solutions internally anyhow!

HTH.

Alan Gauld
Author of the Learn to Program web site

Tutor maillist - Tutor (AT) python (DOT) org

Alan Gauld wrote:
>but on another note does anyone know how to make a 2d array?
>
>
A 2D array is just a table. There are several ways to do that
in Python
<snip several good suggestions>

If you need high-performance arrays you should look at numpy:
http://numpy.scipy.org/

Kent

Tutor maillist - Tutor (AT) python (DOT) org

thank you so much Mr. Gauld that really helped

8/18/06, Alan Gauld <alan.gauld (AT) freenet (DOT) co.ukwrote:

Mr. Kuhlman it says python is not configured for tk.

Gaarrgh! Why do linux distros do this? Stooopid

You will need to fetch another version of Python with
Tk support built in. Its a compile time option so you can
either fetch the source an build it yourself or find a Suse
package with Tk support already selected.

Its really stupid for Suse to do that, it only saves a tiny
amount of space and means you can't run any programs
based on Tkinter

but on another note does anyone know how to make a 2d array?

This should probably be a separate post.

Also can you change the subject line in your posts so people
can fiind the thread easily. I've changed it on this one to pick
up the 2D array issue

A 2D array is just a table. There are several ways to do that
in Python but the easiest is just a list of lists: Think of a chess
game as an example where the boars is represented by
an 8x8 2D array:

chessBoard = [
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0],
[0,0,0,0,0,0,0,0]
]

Now you can access the third row, 4th column with:

chessBoard[2][3] # remember zero indexing!

Is that clear?

You can also use tuples similarly, or nested dictionaries.
A lot will depend on the data you are storing and how you
want to access it.

Finally you can create a Class with bespoke methods to
more closely model your problem, but the class will usaually
have one of the above solutions internally anyhow!

HTH.

Alan Gauld
Author of the Learn to Program web site

Tutor maillist - Tutor (AT) python (DOT) org

Mr. Gauld I run it from termainal on GNME and it says "** IDLE can't import
Tkinter. Your Python may not be configured for Tk. **"

and Yea I am Administrator this is my Home computer after all im only 15.

8/18/06, Alan Gauld <alan.gauld (AT) freenet (DOT) co.ukwrote:
--
thank you but IDLE doesnt seem to work on Suse 9.2 do you know a way
to fix
it?

I've only used IDLE on Linux a few times but it certainly works
on RedHat, Mandriva and Slackware. And it used to work on
Suse 5 - the only time I ever used Suse

What hapens when you try to run IDLE? It may just be a case of
fixing a path setting or somesuch.

Alan G.
>
>
>

Tutor maillist - Tutor (AT) python (DOT) org