Re: [Tutor] how to get response from os.system()
Hi Nathan,
Nathan McBride wrote:
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
Just to hazard a guess -- when you want to pipe commands with pexpect
you have to spawn ('run', it seems, would work the same way) the shell
command as an argument to bash (or similar) since pexpect does not
natively interpret shell operators or wildcards, like redirect, pipe, etc...
from http://pexpect.sourceforge.net/pexpect.html
Remember that Pexpect does NOT interpret shell meta characters such as
redirect, pipe, or wild cards (, |, or *). This is a common mistake.
If you want to run a command and pipe it through another command then
you must also start a shell. For example::
child = pexpect.spawn('/bin/bash -c ls -l | grep LOG log_list.txt')
child.expect(pexpect.EOF)
HTH,
Marty
-Original Message-
From: Jeff Younker [EMAIL PROTECTED]
Sent: Sunday, March 16, 2008 6:59 PM
To: Nathan McBride [EMAIL PROTECTED]
Cc: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
Would you mind perhaps show an example running an interactive
command like su and show how to send input to the commands waiting
propmts?
If you're doing that then you *really* want to be using the pexpect
module.
cmd = pexpect.spawn('su - SOMEINTERACTIVECOMMAND')
cmd.expect('# ') # the prompt
cmd.sendline('A COMMAND')
cmd.expect('# ') # wait for the prompt again
output = cmd.before # the stuff before the prompt
cmd.sendline('exit')
cmd.close()
- Jeff Younker - [EMAIL PROTECTED] -
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Re: [Tutor] my first project: a multiplication trainer
Dear Chris, list,
cheers for the great help: very valuable indeed.
Chris Fuller wrote:
##
for proxyq in choices:
q = questions[proxyq]
answer = raw_input('%dx%d = ' % tuple(q))
if int(answer) == q[0]*q[1]:
print 'correct'
else:
print 'incorrect'
false_answers.append(q)
##
I was unable to find information on tuple(). (The Python help function
was rather conservative in its output, Google not helpful).
What exactly is the use of tuple(q) here, and why does not a simple q
instead of tuple(q) do? The latter would have been my intuitive
expectation...
The other thing I have on my mind is this: how could I have the program
ask the math questions not horizontally but vertically? An example:
4
x7
=
instead of
4x7=
Thank you all,
Guba
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Re: [Tutor] how to get response from os.system()
That's a great tip I'll have to save than.
-Original Message-
From: Martin Walsh [EMAIL PROTECTED]
Sent: Monday, March 17, 2008 9:38 AM
To: Nathan McBride [EMAIL PROTECTED]
Cc: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
Hi Nathan,
Nathan McBride wrote:
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
Just to hazard a guess -- when you want to pipe commands with pexpect
you have to spawn ('run', it seems, would work the same way) the shell
command as an argument to bash (or similar) since pexpect does not
natively interpret shell operators or wildcards, like redirect, pipe, etc..
___
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Re: [Tutor] my first project: a multiplication trainer
You should try some of the Python tutorials out there. There's a difference between tuples and lists, and the parameter list passed to the string formatting operator must be a tuple. String formatting will also solve your second problem. Also, the library reference is your friend. I particularly like the Beazley book, if you want something in hardcopy, but one of the less terse and more introductory O'Rielly books might suit you better. Here's a partial list of (mostly) tutorial resources that I've compiled: http://wiki.python.org/moin/BeginnersGuide http://www.uselesspython.com/gettingstarted.html http://www.freenetpages.co.uk/hp/alan.gauld/ http://www.secnetix.de/olli/Python/ http://pythonology.org/ Cheers ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to get response from os.system()
That's a great tip I'll have to save than.
-Original Message-
From: Martin Walsh [EMAIL PROTECTED]
Sent: Monday, March 17, 2008 9:38 AM
To: Nathan McBride [EMAIL PROTECTED]
Cc: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
Hi Nathan,
Nathan McBride wrote:
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
Just to hazard a guess -- when you want to pipe commands with pexpect
you have to spawn ('run', it seems, would work the same way) the shell
command as an argument to bash (or similar) since pexpect does not
natively interpret shell operators or wildcards, like redirect, pipe, etc..
___
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[Tutor] python, wxpython and postgresql
I'm a newbie to python and would like to build a database app with wxpython and postgresql. Aside from Dabo, I have not found any tutorials that cover reading and writing to a database. Is it so easy that examples are not needed or so impossible that no one can do it. Can someone point me in the right direction. I've got more specific questions but figured this would be a good place to start. Thanks, Bill ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python, wxpython and postgresql
Bill Mais wrote: I'm a newbie to python and would like to build a database app with wxpython and postgresql. Aside from Dabo, I have not found any tutorials that cover reading and writing to a database. Is it so easy that examples are not needed or so impossible that no one can do it. It's neither. There are plenty of examples, but it is fairly easy to do. Ask Google: http://www.google.com/search?hl=enq=python+postgresql+tutorialbtnG=Google+Search Try the first two results from About.com. If you have an issue with a particular tutorial, we can help you with that as well. Can someone point me in the right direction. It's always helpful to do a bit of googling before you ask. You don't want people assuming you're just being lazy ;) I've got more specific questions but figured this would be a good place to start. Sure, ask away. -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to get response from os.system()
That's a great tip I'll have to save than.
-Original Message-
From: Martin Walsh [EMAIL PROTECTED]
Sent: Monday, March 17, 2008 9:38 AM
To: Nathan McBride [EMAIL PROTECTED]
Cc: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
Hi Nathan,
Nathan McBride wrote:
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
Just to hazard a guess -- when you want to pipe commands with pexpect
you have to spawn ('run', it seems, would work the same way) the shell
command as an argument to bash (or similar) since pexpect does not
natively interpret shell operators or wildcards, like redirect, pipe, etc..
___
Tutor maillist - Tutor@python.org
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Re: [Tutor] how to get response from os.system()
That's a great tip I'll have to save than.
-Original Message-
From: Martin Walsh [EMAIL PROTECTED]
Sent: Monday, March 17, 2008 9:38 AM
To: Nathan McBride [EMAIL PROTECTED]
Cc: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
Hi Nathan,
Nathan McBride wrote:
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
Just to hazard a guess -- when you want to pipe commands with pexpect
you have to spawn ('run', it seems, would work the same way) the shell
command as an argument to bash (or similar) since pexpect does not
natively interpret shell operators or wildcards, like redirect, pipe, etc..
___
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Re: [Tutor] how to get response from os.system()
Nathan McBride wrote: That's a great tip I'll have to save than. Nathan, I'm not sure why you sent this three times, but we've gotten it, if you're worried about it. Thanks, -Luke ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python, wxpython and postgresql
Hey Bill, Bill Mais wrote: I'm a newbie to python and would like to build a database app with wxpython and postgresql. I would suggest you first write the basic app to work from the command line. It's easy to debug that way and enables you to focus on the critical features of your app without wasting much, if any, of your time. Once you are able to do the basics from the command line it is generally easy to wrap it in wxPython. As Luke said, there are a lot of examples out there on how to read/write to a postgresql db. At some point, probably after you try a code example or two, you may find the DB API pep helpful: http://www.python.org/dev/peps/pep-0249/ It defines the interface the db adapters (psycopg, for example) are supposed to provide you. We are happy to help when you have specific questions, too. Best, Eric. other keyword pointers include: optparse (makes handling command line options a breeze) raw_input (get user input from the command line) psycopg2 (postgresql database adapter) doctest (document your code with runnable tests) ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python, wxpython and postgresql
Hey, I thought programming was all about the shortcuts ;-) I'm sorry to not be clear. I've done several excellent python + postgresql tutorials, but the one I have not found is wxPython + postgresql (or any database). Specifically, how would you take your sql results and set the values of your wxTextCtrls and wxListCtrls? For example if the sql select statement returns 20 fields the function would find the wxPython controls with the same name and set their values. And how would you build a sql statement with only the wxPython controls that have been modified by the user? So if only the address field was modified the sql would be: UPDATE table1 SET address = '123 Easy Street' WHERE rec_id = 1 Thanks again, Bill ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python, wxpython and postgresql
Unless you have a specific reason for choosing postgresql (an excellent database, just not the easiest), such as having an existing installation, desiring networked access, or nice features such as type safety, you might want to consider SQLite instead. Also, if you stick to the DB-API spec, you will have a fairly easy time of switching databases later, should you wish to. http://www.python.org/peps/pep-0249.html Cheers ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] python, wxpython and postgresql
There are at least a couple of python interfaces to postgresql, but psycopg follows the DB-API spec. You shouldn't have to use the postgresql engine directly. http://www.initd.org/pub/software/psycopg/ The cool bit is that the examples you see that follow DB-API will apply to postgresql, except for the initial connection part. Cheers ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Foothill College Spring Courses
Spring quarter classes start Monday, 7 April, at Foothill College. These two may be of interest to you: 1) Introduction to Python Programming - 5 units Prerequisite: Any programming language experience CIS 68K - Monday evenings at Middlefield campus in Palo Alto 2) Application Software Development with Ajax - 5 units Prerequisite: Knowledge of HTML and JavaScript COIN 71 - Tuesday evenings at Middlefield campus in Palo Alto If you are interested in taking a class, please register as soon as possible by going to: http://www.foothill.fhda.edu/reg/index.php If not enough students sign up, a class may be cancelled. If you have any questions, please contact the instructor, Elaine Haight, at [EMAIL PROTECTED] Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Should config file parser be in module's __init__.py
I'm working on a module consisting of a number of scripts that handle communications over a serial connection. I would like someway for the user to be able to specify which serial port to be used based on a config file in the same directory as the user's program. Should I place the parsing system in the module's init.py, considering that the port will actually be accessed by a different python script in the same module? How could I then let the other scripts access the port information obtained by the parser? Thanks, Shrutarshi ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
