Re: [Tutor] question about looping.
Doug Potter wrote:
for i in routers:
os.system('/bin/touch' %s) % i
of course this dosn't work.
Is there a simple way to get this done?
Yep, someone already answered that you can create the file in write mode
and then close it, but I wanted to add a little more in why your
solution doesn't work.
You're not interpolating the filename INTO the os.system string
The following would work
for i in routers:
os.system('/bin/touch %s'%1)
Granted, you should also provide a filename with a full path for simplicity.
HTH
Hugo
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] embedding python
know a little html not much i can make a page with backround coler a title words and pictures as well as links but i cant find any tutorials on embedding python useing html i found some that use c++ and i think one that used asp Can you give an example of what you mean by *embedding* Python using html? You can represent python code inside HTML easily enough. You can insert Python code into your HTML as script, but it will only work if the readers browser supports it - only IE at present. Or you can do server side python code if the server supports it. What exactly do you have in mind? What were you aiming to achieve? Alan G ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help me with two dimensional arrays in Python
Dear Asrarahmed, I have found the next recipe in the cookbook. It should be interesting for you :) http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/392153 Message: 1 Date: Thu, 05 Oct 2006 10:26:19 -0400 From: Kent Johnson [EMAIL PROTECTED] Subject: Re: [Tutor] Help me with two dimensional arrays in Python Cc: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Asrarahmed Kadri wrote: Its something very close. What I want is: 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 Yours sincerely, __ János Juhász ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python RMI
Hello, I was out for the week-end, sorry If I'm so late answering, and sorry because I wrote my message In italian. Since I have a subscription to another python mailing-list in italian, I've confused the tutor list with that. Thanks, I'm impressed, you were so kind triyng to help me!! I read the all articles at http://www.daimi.au.dk/~mailund/scripting2005/lecture-notes/rmi.html thanks, now I got a very good Idea about RMI and also, web services. Ps.: Ivan grazie di cuore dell'intervento! Daniele 2006/10/7, Ivan Furone [EMAIL PROTECTED]: Il 07/10/06, Alan Gauld [EMAIL PROTECTED] ha scritto: PS. Any Italian speakers on the list who can cover this? I think I can as far it's possible,Alan! :-) Picio [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] Salve, dovrei usare python per due progettini universitari, su RMI e l'altro sui Web Services. Ho notato che esiste PyRO, preferirei però sentire voi sull'argomento: cosa uso per l'RMI (esiste qualche libreria,modulo) cosa uso per i Web Services Ciao, Per quanto riguarda l'RMI vale la pena di dare un'occhiata a quest'esempio,anche se in inglese in quanto il codice e'di per se abbastanza comprensibile: http://www.daimi.au.dk/~mailund/scripting2005/lecture-notes/rmi.html Per quanto riguarda i web services,e'impossibile darti una risposta precisa senza poter conoscere i servizi che devi (o dovresti) utilizzare; prova a girare nella standard library,magari a guardare XML-RPC come altri ti hanno gia'detto;comunque,se cerchi qualcosa di piu'dedicato usa Twisted che e'sicuramente l'eccellenza nel campo della programmazione di rete in Python per completezza e maturita'del codice. Mentre per eventuali ritocchi e implementazione di particolari funzionalita'di basso livello esiste dpkt.. Fai la tua scelta,spero di essere stato esaustivo. __ ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] a Apache-python-postgres kit
Hello, last week I configured three home made servers to host a little python web app (django based). Searching on the web about a kit/script to have Apache+PostgreSQL+Python, I found only Apache2triad. That is a littlel overweight for me because I got also: PHP Perl Mysql Slimftpd Xmail OpenSSL and some other staff I really don't need. Do you know a kit like WAMP or LAMP, that install one of the following configurations? 1-Apache+Posgtres+Python 2-Lighttpd+Posgtgres+Python Do you know some docs to help me create myself the kit? (Something like How to make your own 'wamp' server) Thanks for any answer Daniele ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Point in polygon intro please~!
Hi Michael, Subject: Re: [Tutor] Point in polygon intro please~! To: Michael Shulman [EMAIL PROTECTED] Cc: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=ISO-8859-1; format=flowed Michael Shulman wrote: Hello, I'm very new to both python and OpenGL, but I'm catching on pretty quick, and trying to make a little game. I'm stuck on being able to do this point-in-polygon test though. Everyone seems to say that I should create a ray and see how many sides of a polygon it intersects, (even vs odd) but I have no idea how to go about setting this up. If you would like to get the 3D object, that belongs to the given pixel, OpenGL gives a simpler way for it with glRenderMode(GL_SELECT); Converting the 3D objects to poligons, seems to be too difficult, and not needed. Take a look after the GL_SELECT mode http://www.google.hu/search?hl=huq=glRenderMode%28GL_SELECT%29meta= Yours sincerely, __ János Juhász ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Handling large arrays/lists
One part of the application I'm dealing with handles a conceptual 'cube' of data, but is in fact implemented as a single python list. Items are stored and retrieved - no manipulation at the moment - by the classical approach of multiplying the appropriate x, y and z indices with the x, y and z extents to give the unique index into the single list. However, now that requirements have moved to include much larger cubes of data than originally envisaged, this single list has just become far too slow. Unfortunately the single list concept is currently a requirement in the tool, but how it is implemented is open to discussion. I've been mulling over the documentation for Numeric/numpy to see whether it makes sense to replace the single standard Python list with an array or multiarray. The first thing to strike me is that, in Numeric, the size of an array is fixed. To grow the 'cube' as each x,y slice is added, I can create a new array in one of three ways, but as far as I can see, each will require copying all of the data from the old to the new array, so I'm concerned that any speed benefit gained from replacing a standard list will be lost to repeated copying. Have I correctly understood the Numeric array handling? Does anyone have any suggestions for a more efficient way of handling a large list of data? Other modules perhaps? And yes, I know that Numeric has been replaced by numpy, but I understand that they are very similar, and it's been easier to find tutorial documentation for Numeric than for numpy. Cheers Duncan ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] tkinter
hello,We try to build new software using python and tkinter. We would like to enter some fields using grid style. I mean we want to use rows to see old entries and to enter new one. I hope I could explain, because it also is not easy. I know there is grid to locate buttons, labels and something like these. I hope I could explain I did not mean this grid which is using instead of pack. we wonder if there is already some classes or widgets to do this.thanks for help from nowAbdullah Anar ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] re-reading file-like objects
Hi!
I have a problem with file-like objects for months now, and I hoped I could
cope with it, but I keep using what seems to me like a newbie workaround...
The question is: how can I read a file (more precisely, a file-like object)
more than one single time?
In the following example, I want to generate a file in memory and save it with
ten different names. But I can't do it with shutil.copyfileobj, AFAICS
because it reads the file with read() method, which can only be used once. If
it's a real file, on disk, I agree it would not be a clever strategy, reading
it once for each copy, and I would be happy keeping its content in a
variable. But if the file is in memory, why can't I simply read it again (or
better, how can I...)?
successful==
import subprocess
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefilecontents =
subprocess.Popen(['dd', 'if=/dev/zero', 'count=1', 'bs=%s' % FILESIZE],
stdout=subprocess.PIPE, bufsize=FILESIZE).stdout.read()
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
newfile.write(basefilecontents)
newfile.close()
=unsuccessful==
import subprocess, shutil
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefile = subprocess.Popen(['dd', 'if=/dev/zero', 'count=1', 'bs=%s' %
FILESIZE], stdout=subprocess.PIPE, bufsize=FILESIZE).stdout
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
shutil.copyfileobj(basefile, newfile)
newfile.close()
=
The program runs fine, but only the first file has the appropriate content.
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects (SOLVED?)
I keep the original question:
Em Segunda 09 Outubro 2006 09:21, Tiago Saboga escreveu:
Hi!
I have a problem with file-like objects for months now, and I hoped I could
cope with it, but I keep using what seems to me like a newbie workaround...
The question is: how can I read a file (more precisely, a file-like object)
more than one single time?
In the following example, I want to generate a file in memory and save it
with ten different names. But I can't do it with shutil.copyfileobj, AFAICS
because it reads the file with read() method, which can only be used once.
If it's a real file, on disk, I agree it would not be a clever strategy,
reading it once for each copy, and I would be happy keeping its content in
a variable. But if the file is in memory, why can't I simply read it again
(or better, how can I...)
But I strip the code, and post a new one. The solution I found is in the
seek() method of the file object. And the problem I had is that not all the
file-like objects have a functional seek() method. It's not the case for the
object referenced by the stdout attribute of the subprocess.Popen class. So I
have to copy it in a (seekable) temporary file. As I have already bothered
you with my question, let's try to make it still useful: is it the right
(or pythonic) way to do this?
Thanks,
Tiago.
solution
import subprocess, shutil, tempfile
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
cmd = ['dd', 'if=/dev/zero', 'count=1', 'bs=%s' % FILESIZE]
tempbasefile = tempfile.TemporaryFile()
basefile = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
bufsize=FILESIZE
).stdout
shutil.copyfileobj(basefile, tempbasefile)
for i in range(NUMBER):
tempbasefile.seek(0)
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
shutil.copyfileobj(tempbasefile, newfile)
newfile.close()
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] tkinter
We try to build new software using python and tkinter. We would like to enter some fields using grid style. Based on the fact that you say: these. I hope I could explain I did not mean this grid which is using instead of pack. I assume you mean like a spreadsheet grid of cells? we wonder if there is already some classes or widgets to do this. I'm not aware of such a control but its quite likely someone has built one. Try asking on the Tkinter mailing list, they are more likely to know. Sorry I can't help further, Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] revisiting struct and bytes again.
i can make a byte a string or number or whatever now. Up to the number 255. I now have a problem with something that comes in as a 4 byte representation of the number of seconds since 1970. Hi Shawn, That's an epoch time as used in UNIX. Are you sure that what you're trying to do cannot be done with the Python time module? What is it exactly that you're trying to do? Hugo ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects
Tiago Saboga wrote:
Hi!
I have a problem with file-like objects for months now, and I hoped I could
cope with it, but I keep using what seems to me like a newbie workaround...
The question is: how can I read a file (more precisely, a file-like object)
more than one single time?
In the following example, I want to generate a file in memory and save it
with
ten different names. But I can't do it with shutil.copyfileobj, AFAICS
because it reads the file with read() method, which can only be used once. If
it's a real file, on disk, I agree it would not be a clever strategy, reading
it once for each copy, and I would be happy keeping its content in a
variable. But if the file is in memory, why can't I simply read it again (or
better, how can I...)?
successful==
import subprocess
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefilecontents =
subprocess.Popen(['dd', 'if=/dev/zero', 'count=1', 'bs=%s' % FILESIZE],
stdout=subprocess.PIPE, bufsize=FILESIZE).stdout.read()
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
newfile.write(basefilecontents)
newfile.close()
Your input file isn't 'in memory', it is the output of a subprocess. To
read the input again, the subprocess would have to create the output again.
This solution seems fine to me - you read the input file *contents* into
memory, then write it to multiple files. Why don't you like this approach?
Kent
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects (SOLVED?)
Tiago Saboga wrote:
But I strip the code, and post a new one. The solution I found is in the
seek() method of the file object. And the problem I had is that not all the
file-like objects have a functional seek() method. It's not the case for the
object referenced by the stdout attribute of the subprocess.Popen class. So I
have to copy it in a (seekable) temporary file. As I have already bothered
you with my question, let's try to make it still useful: is it the right
(or pythonic) way to do this?
Thanks,
Tiago.
solution
import subprocess, shutil, tempfile
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
cmd = ['dd', 'if=/dev/zero', 'count=1', 'bs=%s' % FILESIZE]
tempbasefile = tempfile.TemporaryFile()
basefile = subprocess.Popen(
cmd,
stdout=subprocess.PIPE,
bufsize=FILESIZE
).stdout
shutil.copyfileobj(basefile, tempbasefile)
for i in range(NUMBER):
tempbasefile.seek(0)
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
shutil.copyfileobj(tempbasefile, newfile)
newfile.close()
This is similar to your first successful solution in a way - you are
reading the contents of the input file and storing them in a temporary
location. In the first version you stored the contents in memory; in
this one you store the contents in a temp file. Unless the data is too
large to fit in memory I think the first program is preferable, it is
simpler and will likely be faster.
Kent
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects
because it reads the file with read() method, which can only be used
once. If
it's a real file, on disk, I agree it would not be a clever
strategy, reading
it once for each copy, and I would be happy keeping its content in a
variable. But if the file is in memory, why can't I simply read it
again (or
better, how can I...)?
Not all file like objects support the seek() call, often for good
reasons - they are streams for example.
However it sounds like you could use a StringIO buffer object for
what you want and you can reuse that as often as you like.
Look here for more info:
http://docs.python.org/lib/module-StringIO.html
HTH
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
successful==
import subprocess
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefilecontents =
subprocess.Popen(['dd', 'if=/dev/zero', 'count=1', 'bs=%s' %
FILESIZE],
stdout=subprocess.PIPE, bufsize=FILESIZE).stdout.read()
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
newfile.write(basefilecontents)
newfile.close()
=unsuccessful==
import subprocess, shutil
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefile = subprocess.Popen(['dd', 'if=/dev/zero', 'count=1',
'bs=%s' %
FILESIZE], stdout=subprocess.PIPE, bufsize=FILESIZE).stdout
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
shutil.copyfileobj(basefile, newfile)
newfile.close()
=
The program runs fine, but only the first file has the appropriate
content.
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
[Tutor] What after Learning Python 2nd
Hi.Hi I have finished Learning Python 2nd ed. What to do next? Should I go with Programming Python book or Python Cookbook or? Or maybe something else?Thanks people! Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail.___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects
Em Segunda 09 Outubro 2006 10:41, Kent Johnson escreveu:
Tiago Saboga wrote:
Hi!
I have a problem with file-like objects for months now, and I hoped I
could cope with it, but I keep using what seems to me like a newbie
workaround...
The question is: how can I read a file (more precisely, a file-like
object) more than one single time?
In the following example, I want to generate a file in memory and save it
with ten different names. But I can't do it with shutil.copyfileobj,
AFAICS because it reads the file with read() method, which can only be
used once. If it's a real file, on disk, I agree it would not be a clever
strategy, reading it once for each copy, and I would be happy keeping its
content in a variable. But if the file is in memory, why can't I simply
read it again (or better, how can I...)?
successful==
import subprocess
FILESIZE = 20
NUMBER = 10
DIR = '/tmp/pytest'
FILENAME = 'treco.x'
basefilecontents =
subprocess.Popen(['dd', 'if=/dev/zero', 'count=1', 'bs=%s' % FILESIZE],
stdout=subprocess.PIPE, bufsize=FILESIZE).stdout.read()
for i in range(NUMBER):
print File number %s % i
newfile = open('%s/%s%s' % (DIR, FILENAME, i), 'w')
newfile.write(basefilecontents)
newfile.close()
Your input file isn't 'in memory', it is the output of a subprocess. To
read the input again, the subprocess would have to create the output again.
This solution seems fine to me - you read the input file *contents* into
memory, then write it to multiple files. Why don't you like this approach?
I'm afraid I don't fully understand file objects. I thought I could use it
just as a file: if I have one, and I want several copies, I just save it with
several names. So, if Popen.stdout already is a file object, I thought the
easier way would be to save it with another name. I see that it is more
complicated.
For this simple example, this solution is fine, and I think the solution
proposed by Alan (StringIO) is not going to add anything. Would it be faster?
Thanks,
Tiago.
Kent
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What after Learning Python 2nd
Those are both fine next book choices, and neither should prove a disapointment. However, LP should've left you with just enough knowledge to be dangerous, so I'd encourage you to work on several small projects in python using what you already know. In the process of taking a crack at those, you'll surely want to do some things that will give you a good idea of what resources you need to tackle next. -Rob A. On 10/9/06, josip [EMAIL PROTECTED] wrote: Hi. Hi I have finished Learning Python 2nd ed. What to do next? Should I go with Programming Python book or Python Cookbook or? Or maybe something else? ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Variable help
Hi!
I think your problem was solved, and that the list of lists is the better
approach indeed. But I'd like to add an answer to a direct question you
asked:
Em Domingo 08 Outubro 2006 07:47, Tom R. escreveu:
Basically I want to be able to integrate the value of one variable into
another variables name.
I think you would like to do something like:
=
#!/usr/bin/env python
# use of __get_attribute__() function
class players(object):
player1 = [2,4,8]
player2 = [3,9,27]
player3 = [4,16,64]
count = 2
pl = players()
actual_player_string = player%s % count
if pl.__getattribute__(actual_player_string)[2]==9:
print 'It worked.'
===
I don't know how to do that if player{1,2,3} are not in a class, or if the
class is not instanciated. But somebody else can possibly show a way.
Anyway, as I said, I think you don't need it right now.
Tiago.
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Variable help
Tiago Saboga wrote:
Hi!
I think your problem was solved, and that the list of lists is the better
approach indeed. But I'd like to add an answer to a direct question you
asked:
Em Domingo 08 Outubro 2006 07:47, Tom R. escreveu:
Basically I want to be able to integrate the value of one variable into
another variables name.
I think you would like to do something like:
=
#!/usr/bin/env python
# use of __get_attribute__() function
class players(object):
player1 = [2,4,8]
player2 = [3,9,27]
player3 = [4,16,64]
count = 2
pl = players()
actual_player_string = player%s % count
if pl.__getattribute__(actual_player_string)[2]==9:
print 'It worked.'
Better to use the built-in getattr() function:
geattr(pl, actual_player_string)
===
I don't know how to do that if player{1,2,3} are not in a class, or if the
class is not instanciated. But somebody else can possibly show a way.
There are ways to do it but really it's better not to.
Kent
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What after Learning Python 2nd
Hi I have finished Learning Python 2nd ed. What to do next? Should I go with Programming Python book or Python Cookbook or? Or maybe something else? However, LP should've left you with just enough knowledge to be dangerous, so I'd encourage you to work on several small projects in python using what you already know. In the process of taking a crack at those, you'll surely want to do some things that will give you a good idea of what resources you need to tackle next. hi josip, rob is right. you should really start cranking out some code. from the book perspective, LP is similar to Beginning Python (Hetland) or Dive into Python (Pilgrim), all of which are great intros to get your feet wet with Python. the two books you suggested point you in different directions: Programming Python should be used if you want to see many different case studies using Python in all kinds of ways, most with large bodies of application code. The Cookbook is used to see code snippets to perform specific tasks. the code is usually much shorter are typically not complete applications. another (unbiased?) suggestion would be my book, Core Python, which just came out a few weeks ago. it takes the 3 books i mentioned above and dives much deeper into how Python works under the covers, with the goal of making you more of an effective Python programmer in as short of a time as possible. plus there are many interesting exercises at the end of every chapter, a great place to start really getting some coding under your belt. hope this helps and good luck! -- wesley - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Core Python Programming, Prentice Hall, (c)2007,2001 http://corepython.com wesley.j.chun :: wescpy-at-gmail.com python training and technical consulting cyberweb.consulting : silicon valley, ca http://cyberwebconsulting.com ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What after Learning Python 2nd
On Mon, Oct 09, 2006 at 10:51:26AM -0700, josip wrote: Hi. Hi I have finished Learning Python 2nd ed. What to do next? Should I go with Programming Python book or Python Cookbook or? Or maybe something else? Thanks people! I went from Learning Python to the Python Cookbook and have been very happy. The Cookbook is loaded with great tips in pretty much every area of programming, and it's great to get so many insights. I've also been pleasantly surprised by the usefulness of the intros to each section, written by some of the superstars of the Python community. gabe - Do you Yahoo!? Get on board. You're invited to try the new Yahoo! Mail. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Menus / Mac
I'm trying to learn menus, starting with a textbook example. The textbook example (pasted below) doesn't work, but doesn't die either: It opens a window that has no menu. I'm guessing it is a Mac problem. I've tried it on 3 different Macs, with slightly different dates and configurations of Python and its libraries. Same story each time. But, mailing the same program to someone who pasted it into a PC program -- it was fine. On the Mac, I'm running straight from Terminal/Unix, that is, I'm not using IDLE. Hard to believe that something this basic would not be running not be noticed -- but I'm at a loss. The program is below. Thanks, Joel Levine from Tkinter import * def callback(): print called the callback! root = Tk() # create a menu menu = Menu(root) root.config(menu=menu) filemenu = Menu(menu) menu.add_cascade(label=File, menu=filemenu) filemenu.add_command(label=New, command=callback) filemenu.add_command(label=Open..., command=callback) filemenu.add_separator() filemenu.add_command(label=Exit, command=callback) helpmenu = Menu(menu) menu.add_cascade(label=Help, menu=helpmenu) helpmenu.add_command(label=About..., command=callback) mainloop() ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Seeking good resources for Tkinter
Hi folks, I want to learn the GUI programming in Python. Can you suggest some nice web resources as well as books to start. Thanks in anticipation. Regards, Asrar-- To HIM you shall return. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Menus / Mac
On 09 Oct 2006 15:43:01 -0400, Joel Levine [EMAIL PROTECTED] wrote: I'm guessing it is a Mac problem. I've tried it on 3 different Macs, with slightly different dates and configurations of Python and its libraries. Same story each time. It works for me :-) (MBPro, Tiger) Remember that macs have a universal menu bar. If you click on the window it created, the menubar at the top should change appropriately. -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] tkinter
On Mon, 9 Oct 2006 14:00:26 +0100 Alan Gauld [EMAIL PROTECTED] wrote: We try to build new software using python and tkinter. We would like to enter some fields using grid style. Based on the fact that you say: these. I hope I could explain I did not mean this grid which is using instead of pack. I assume you mean like a spreadsheet grid of cells? we wonder if there is already some classes or widgets to do this. I'm not aware of such a control but its quite likely someone has built one. Try asking on the Tkinter mailing list, they are more likely to know. As far as I know the tktable widget (http://tktable.sourceforge.net) is a quite advanced spreadsheet widget, and there is a Python wrapper module in the demos directory, I never used it though. Another option is the Tix.Grid, unfortunately there is only a partially implememted (and partially broken) python interface included in the Python-2.5 Tix module. For more functionality you can try the Tix.Grid wrapper I wrote a while ago (http://www.8ung.at/klappnase/TixGrid/TixGrid.html), however it is not much tested and the tixGrid itself seems to be alpha or beta quality, some methods do not seem to have any effect. I hope this helps Michael ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Seeking good resources for Tkinter
On Mon, 9 Oct 2006 22:04:17 +0100 Asrarahmed Kadri [EMAIL PROTECTED] wrote: Hi folks, I want to learn the GUI programming in Python. Can you suggest some nice web resources as well as books to start. Thanks in anticipation. Hi Asrar, for Tkinter a good place to start is the wiki: http://tkinter.unpy.net/wiki/ Several Tkinter books are mentioned here: http://tkinter.unpy.net/wiki/books where John Grayson's Python and Tkinter programming is (although it is a little outdated) still the ultimate resource. For a start the Tkinter reference from New Mexico Tech (http://infohost.nmt.edu/tcc/help/lang/python/tkinter.html) and Frederik Lundh's book (http://www.pythonware.com/library/tkinter/introduction/) are good, too (and they are free). I hope this helps Michael ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] What after Learning Python 2nd
Hi I have finished Learning Python 2nd ed. What to do next? Write code. Lots of code. Think of a project that will need more than a single file so you get practice with modules. Think of a project that can use OOP to practice with objects. Do some text processing, or write a web client to try out regular expressions or HTML parsing. In other words get some experience under your belt before worrying about advanced coding features etc. Should I go with Programming Python book or Python Cookbook Two very different books! Personally I would go for Programming Python because I've never been a fan of cookbook type books. They tend to encourage cut n' paste style reuse where you don't necessarily understand the why. I prefer the wider coverage of PP with lots of real code. But its a very personal choice, one of my colleaguers loves cookbooks and has one for each of the different languages we use. I do recommend a reference book too, like the Beasley or Martelli books -- Alan Gauld Author of the Learn to Program web site http://www.freenetpages.co.uk/hp/alan.gauld ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Seeking good resources for Tkinter
I want to learn the GUI programming in Python. Can you suggest some nice web resources as well as books to start. It never fails to amaze me how often we get near identical questions being asked within a few days of each other and then never mentioned again for weeks! There are many different GUI toolkits for Python but the two most commonly used are: wxPython and Tkinter. Tkinter is based ob Tcl/Tk and comes as standard in Python but has slightly less sophisticated widgets and some folks don't like its looks.Try the Tkinter Topic Guide in the Documentation section of the Python web site for links to references and tutorials. There are some books too. wxPython has its own web site and is based on a C++ framework called wxWidgets which also has a web site full of references which are very good if you can read C++. HTH, Alan G. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Threaded FTP class
Hi all,
I'm trying to make a small, threaded FTP app and I'm running into
a problem.
My program has a GUI (I use PythonCard) and I want the GUI to be
responsive while network operations are going on.
I assumed that if I made a class (shown below) which was sub-classed
from threading.Thread - I wouldn't have any problems.
My GUI class (not shown) has a 'connect' button with a method that
looks like this:
def on_connect_command(self, event):
Connect to the remote server.
# getConnectData() - returns a tuple with
# all of the data we need to connect.
server, username, password = self.getConnectData()
# Instantiate my threaded FTP class.
self.host = FTP(server, username, password)
self.host.setDaemon(True)
self.host.start()
time.sleep(1)
When I hit this button, the GUI is completely responsive while trying to
connect to the remote server. I have no problems and everything works as
expected.
Here's where I get the problem... The GUI class has another method which
looks like this:
def on_getData_command(self, event):
# getDirectoryData(...) is a method in the
# FTP() class. It walks a remote directory.
self.host.getDirectoryData(someDirectory)
When I fire this method - it blocks until getDirectoryData() returns,
which makes the GUI non-responsive. It's *not* hanging due to a network
problem (it will only fire if you're connected to the remote server.)
Why does this one method block? I assumed it would run in the FTP class
thread and I'd have no problems!? What should I do different?
Thanks,
Bill
A simplified version of my FTP class:
code
class FTP(threading.Thread):
This class requires ftputil which you can download
from here - http://ftputil.sschwarzer.net/download
def __init__(self, server, username, password):
threading.Thread.__init__(self)
self.server = server
self.username = username
self.password = password
self.host = None
self.connected = False
def run(self):
Connects to the remote server and prints a list
containing files and directories from the current
directory.
This does not block the GUI!
try:
self.host = ftputil.FTPHost(
self.server,
self.username,
self.password)
data = self.getDirData()
self.connected = True
print data
except ftputil.ftp_error.FTPOSError:
self.connected = False
print 'Could not connect to remote server!'
def getDirData(self):
Returns a list containing remote 'listdir' output.
return [d for d in self.host.listdir(self.host.curdir)]
def getDirectoryData(self, directory):
Walks the remote directory and then prints a list containing
the files which were found.
This blocks the GUI!
if self.connected:
fileList = []
self.host.chdir(directory)
for root, dirs, files in self.host.walk(self.host.curdir):
for f in files:
fileList.append(self.host.path.abspath(
self.host.path.join(root, f)))
self.host.chdir('..')
print fileList
def disconnect(self):
Disconnect from the remote server.
self.host.close()
self.connected = False
/code
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] re-reading file-like objects
Tiago Saboga wrote: I'm afraid I don't fully understand file objects. I thought I could use it just as a file: if I have one, and I want several copies, I just save it with several names. So, if Popen.stdout already is a file object, I thought the easier way would be to save it with another name. I see that it is more complicated. A file-like object doesn't represent a file on disk so much as a data stream. It is a place you can read data from or write data to. When you call subprocess.Popen(), you get back a data stream representing the output of the process you started. You can read through this stream once, when you get to the end it's done. Just like when you run the process from the console, it just outputs once. If you want to use the output more than once you can copy it or save it or run the process again. Some file-like objects do let you seek to a specific location, but not all. Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] tkinter
Hi Abdullah! There is a kind of grid for tkinter that you can find online in the python cookbook, search for MultiListbox. But if you really want a spreadsheet like grid, you'd rather use wx.grid from wxPython. wxPython is much more powerfull than tkinter and is as easy to learn. You can find lots od doc's in www.wxpython.org. Date: Mon, 9 Oct 2006 14:23:32 +0300 From: Abdullah Anar [EMAIL PROTECTED] Subject: [Tutor] tkinter To: tutor@python.org Message-ID: [EMAIL PROTECTED] Content-Type: text/plain; charset=iso-8859-1 hello, We try to build new software using python and tkinter. We would like to enter some fields using grid style. I mean we want to use rows to see old entries and to enter new one. I hope I could explain, because it also is not easy. I know there is grid to locate buttons, labels and something like these. I hope I could explain I did not mean this grid which is using instead of pack. we wonder if there is already some classes or widgets to do this. thanks for help from now Abdullah Anar -- next part -- An HTML attachment was scrubbed... URL: http://mail.python.org/pipermail/tutor/attachments/20061009/41a5ee23/attachment-0001.html ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Threaded FTP class
Bill Burns wrote: I'm trying to make a small, threaded FTP app and I'm running into a problem. My program has a GUI (I use PythonCard) and I want the GUI to be responsive while network operations are going on. I assumed that if I made a class (shown below) which was sub-classed from threading.Thread - I wouldn't have any problems. My GUI class (not shown) has a 'connect' button with a method that looks like this: def on_connect_command(self, event): Connect to the remote server. # getConnectData() - returns a tuple with # all of the data we need to connect. server, username, password = self.getConnectData() # Instantiate my threaded FTP class. self.host = FTP(server, username, password) self.host.setDaemon(True) self.host.start() time.sleep(1) When I hit this button, the GUI is completely responsive while trying to connect to the remote server. I have no problems and everything works as expected. In this method you create a new thread and start it. The thread's run() method is called. It connects to the remote server, fetches and prints a directory and returns. At that point (when the run() method returns) the FTP thread is dead. Here's where I get the problem... The GUI class has another method which looks like this: def on_getData_command(self, event): # getDirectoryData(...) is a method in the # FTP() class. It walks a remote directory. self.host.getDirectoryData(someDirectory) When I fire this method - it blocks until getDirectoryData() returns, which makes the GUI non-responsive. It's *not* hanging due to a network problem (it will only fire if you're connected to the remote server.) Why does this one method block? I assumed it would run in the FTP class thread and I'd have no problems!? What should I do different? No, you don't do anything here to make the getDirectoryData() method run in a separate thread. Just because the FTP class has (or had) one thread at one time doesn't automatically make all of the FTP class methods run in a different thread. There are a few different ways you could handle this. You could have each command in the FTP class be smart enough to start a new thread to run the command. You don't actually have to subclass threading.Thread, you can just create a thread and tell it what method to execute. (Side note - this might be a good use for a @run_in_thread decorator.) You could make a separate class for each command. This would be pretty similar to the above solution. You would probably want a base class or utility class to hold the common details of connecting and sending a command. You could make a thread that really does keep running, that listens to for commands from a Queue. Your GUI thread would put a command in the Queue, the daemon thread would pull a command out and execute it. You could figure out how to do this with Twisted... HTH, Kent ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Threaded FTP class
I'm trying to make a small, threaded FTP app and I'm running into a problem. My program has a GUI (I use PythonCard) and I want the GUI to be responsive while network operations are going on. I assumed that if I made a class (shown below) which was sub-classed from threading.Thread - I wouldn't have any problems. My GUI class (not shown) has a 'connect' button with a method that looks like this: def on_connect_command(self, event): Connect to the remote server. # getConnectData() - returns a tuple with # all of the data we need to connect. server, username, password = self.getConnectData() # Instantiate my threaded FTP class. self.host = FTP(server, username, password) self.host.setDaemon(True) self.host.start() time.sleep(1) When I hit this button, the GUI is completely responsive while trying to connect to the remote server. I have no problems and everything works as expected. In this method you create a new thread and start it. The thread's run() method is called. It connects to the remote server, fetches and prints a directory and returns. At that point (when the run() method returns) the FTP thread is dead. Here's where I get the problem... The GUI class has another method which looks like this: def on_getData_command(self, event): # getDirectoryData(...) is a method in the # FTP() class. It walks a remote directory. self.host.getDirectoryData(someDirectory) When I fire this method - it blocks until getDirectoryData() returns, which makes the GUI non-responsive. It's *not* hanging due to a network problem (it will only fire if you're connected to the remote server.) Why does this one method block? I assumed it would run in the FTP class thread and I'd have no problems!? What should I do different? No, you don't do anything here to make the getDirectoryData() method run in a separate thread. Just because the FTP class has (or had) one thread at one time doesn't automatically make all of the FTP class methods run in a different thread. There are a few different ways you could handle this. You could have each command in the FTP class be smart enough to start a new thread to run the command. You don't actually have to subclass threading.Thread, you can just create a thread and tell it what method to execute. (Side note - this might be a good use for a @run_in_thread decorator.) You could make a separate class for each command. This would be pretty similar to the above solution. You would probably want a base class or utility class to hold the common details of connecting and sending a command. You could make a thread that really does keep running, that listens to for commands from a Queue. Your GUI thread would put a command in the Queue, the daemon thread would pull a command out and execute it. You could figure out how to do this with Twisted... Kent, Thank you for the explanation and ideas!! I wasn't exactly sure how the threading was working but you've enlightened me! Bill ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] multithreading random()
Please refer to http://www.python.org/doc/current/lib/module-random.html, from which I quote: The functions supplied by this module are actually bound methods of a hidden instance of the random.Random class. You can instantiate your own instances of Random to get generators that don't share state. This is especially useful for multi-threaded programs, creating a different instance of Random for each thread, and using the jumpahead() method to make it likely that the generated sequences seen by each thread don't overlap. Could someone point me to an example script where this was done? I'd very much like to learn how to do that. And another question. That page also says, Almost all module functions depend on the basic function random(), which generates a random float uniformly in the semi-open range [0.0, 1.0). Python uses the Mersenne Twister as the core generator. It produces 53-bit precision floats and has a period of 2**19937-1. What is a 53-bit precision float? Would that be something like a float accurate to 8 or 9 figures (dividing 53 by 8). Or what? Thanks, Dick Moores ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] multithreading random()
On 10/10/06, Dick Moores [EMAIL PROTECTED] wrote: And another question. That page also says, Almost all module functions depend on the basic function random(), which generates a random float uniformly in the semi-open range [0.0, 1.0). Python uses the Mersenne Twister as the core generator. It produces 53-bit precision floats and has a period of 2**19937-1. What is a 53-bit precision float? Would that be something like a float accurate to 8 or 9 figures (dividing 53 by 8). Or what? Hi Dick, Have a look here: http://en.wikipedia.org/wiki/Double_precision and here: http://en.wikipedia.org/wiki/IEEE_floating-point_standard Basically, floating point numbers are of the form x times 2**y, where x is a binary number between 1 and 10 (that's binary 10, decimal 2). 53 bits means 53 binary digits of precision (including the initial 1). Does that help? -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] multithreading random()
On 10/10/06, Dick Moores [EMAIL PROTECTED] wrote: Please refer to http://www.python.org/doc/current/lib/module-random.html, from which I quote: The functions supplied by this module are actually bound methods of a hidden instance of the random.Random class. You can instantiate your own instances of Random to get generators that don't share state. This is especially useful for multi-threaded programs, creating a different instance of Random for each thread, and using the jumpahead() method to make it likely that the generated sequences seen by each thread don't overlap. Could someone point me to an example script where this was done? I'd very much like to learn how to do that. Using google's code search, I found this: def _create_random_generators(self, num, delta, firstseed=None): Return list of 'num' distinct generators. Each generator has its own unique segment of delta elements from Random.random()'s full period. Seed the first generator with optional arg firstseed (default is None, to seed from current time). g = Random(firstseed) result = [g] for i in range(num - 1): laststate = g.getstate() g = Random() g.setstate(laststate) g.jumpahead(delta) result.append(g) return result Although, from looking at the docs you quoted, this may not be correct for python2.3+. -- John. ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
