[Tutor] Is it possible?
Is it possible to write a program that you pipe other programs through and it measures the MBs per second of data moved? Like I could pipe it a cp and find out how fast the cp is working? Thanks, Nate ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] beginner pexpect question
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Hey guys,
I'm practically still a beginner with python. I am working on a program
that originally I used popen for but then switched to pexpect because it
was easier for me to understand.
I was hoping someone could help me get this working:
I do a:
child = pexpect.spawn ('cryptsetup --verbose --cipher
"aes-cbc-essiv:sha256" --key-size 256 --verify-passphrase luksFormat ' +
self.loopdevice)
i = child.expect ([pexpect.TIMEOUT, '.*'])
if i == 0:
print 'ERROR!'
print child.before, child.after
child.sendline ('YES')
print "Sent YES"
child.expect ('.*')
#child.sendline ('Test')
child.send ('Test\n')
print "Sent Pass 1"
child.expect ('.*')
child.send ('Test\n')
print "Sent Pass 2"
#child.sendline ('Test')
This runs without errors but then to test I do a:
[EMAIL PROTECTED] project]# losetup /dev/loop0 /home/user/deleteme
[EMAIL PROTECTED] project]# cryptsetup luksOpen /dev/loop0 encr-container1
Enter LUKS passphrase:
/dev/loop0 is not a LUKS partition
Command failed: No key available with this passphrase.
I can't understand this at all. If anyone can help I would appreciate
it a lot.
Thanks very much,
Nate
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Re: [Tutor] beginner pexpect question
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Anyone have any recomendations? Seems like it is giving it the
passwords since it finishes cleanly,
but maybe not like I think?
Nate
Nathan McBride wrote:
> Hey guys,
>
> I'm practically still a beginner with python. I am working on a program
> that originally I used popen for but then switched to pexpect because it
> was easier for me to understand.
> I was hoping someone could help me get this working:
>
> I do a:
>
> child = pexpect.spawn ('cryptsetup --verbose --cipher
> "aes-cbc-essiv:sha256" --key-size 256 --verify-passphrase luksFormat ' +
> self.loopdevice)
> i = child.expect ([pexpect.TIMEOUT, '.*'])
> if i == 0:
> print 'ERROR!'
> print child.before, child.after
> child.sendline ('YES')
> print "Sent YES"
> child.expect ('.*')
> #child.sendline ('Test')
> child.send ('Test\n')
> print "Sent Pass 1"
> child.expect ('.*')
> child.send ('Test\n')
> print "Sent Pass 2"
> #child.sendline ('Test')
>
> This runs without errors but then to test I do a:
>
> [EMAIL PROTECTED] project]# losetup /dev/loop0 /home/user/deleteme
> [EMAIL PROTECTED] project]# cryptsetup luksOpen /dev/loop0 encr-container1
> Enter LUKS passphrase:
> /dev/loop0 is not a LUKS partition
> Command failed: No key available with this passphrase.
>
> I can't understand this at all. If anyone can help I would appreciate
> it a lot.
>
> Thanks very much,
> Nate
>
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Re: [Tutor] how to get response from os.system()
Why don't you just use 'commands.getoutput'?
-Original Message-
From: linuxian iandsd <[EMAIL PROTECTED]>
Sent: Sunday, March 16, 2008 3:12 PM
To: tutor@python.org
Subject: Re: [Tutor] how to get response from os.system()
use os.popen("your cmd here")
On Sun, Mar 16, 2008 at 8:06 PM, Luke Paireepinart <[EMAIL PROTECTED]>
wrote:
> shawn bright wrote:
> > Lo there all,
> >
> > I am needing to get a response back from a system command.
> > i can do this:
> >
> > os.system('mailq | wc -l")
> >
> > if i do this in the terminal mailq | wc -l , it will spit out a
> number.
> > How do i get that number as a python variable ?
> You need to use the subprocess module, specifically subprocess.Popen, to
[The entire original message is not included]
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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? -Original Message- From: linuxian iandsd <[EMAIL PROTECTED]> Sent: Sunday, March 16, 2008 3:17 PM To: tutor@python.org Subject: Re: [Tutor] how to get response from os.system() i guess that was too short tutorial well, here is an example from a live session on the interpreter. [EMAIL PROTECTED] ~]# python Python 2.5.1 (r251:54863, Nov 23 2007, 16:16:53) [GCC 4.1.1 20070105 (Red Hat 4.1.1-51)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> >>> cmd='ping -c 1 localhost' >>> import os >>> a=os.popen(cmd) >>> print a >>> print a.read() PING serv.kontactel.loc (127.0.0.1) 56(84) bytes of data. 64 bytes from serv.kontactel.loc (127.0.0.1): icmp_seq=1 ttl=64 time=0.134ms [The entire original message is not included] ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to get response from os.system()
Yup I use the pexpect module for a lot however couldn't get 'pexpect.run' to
work with mysqldump piping to gzip
-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] 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()
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()
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()
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] Maybe advanced pexpect question?
I've used pexpect for a few projects and love it. Basically pexpect lets you spawn a program and interact with it from code like you yourself were running it in a console. How would you send the ctrl key? nomb ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Maybe advanced pexpect question?
I'm thinking more along the lines as of running a program, sending tab
to get to the field send text to put on the field, tab, send text ?
On Sun, 2008-03-23 at 14:00 -0500, mwalsh wrote:
> Kent Johnson wrote:
> > Nathan McBride wrote:
> >> I've used pexpect for a few projects and love it. Basically pexpect
> >> lets you spawn a program and interact with it from code like you
> >> yourself were running it in a console. How would you send the ctrl key?
> >
> > I don't use pexpect, so I am guessing...
> >
> > The ctrl key by itself is not a character so you can't send that. ctrl-C
> > is a character that is represented in a string as \x03. I expect you
> > would send a control character with sendline(), for example to sent
> > ctrl-C try
> >child.sendline ('\x03')
>
> In recent versions of pexpect (I'm looking at 2.3), 'spawn' objects
> include a sendcontrol method which does almost exactly that for cntl-c,
> with send instead of sendline.
>
> > Kent
> > ___
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[Tutor] socket / over network
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hey guys, I'm pretty tired of the lame backup solution we have at work. Could anyone point me to a (more or less newbieish) example of how to have python open a socket on one box and get data from it, then have another box write to it over the network? I'm having trouble finding something like this. Thanks, Nate -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFH9PUf/n+duykW6K8RAvXMAKCE5708Bly/9fzHFZu45cd/d11WGQCdGNcG PWcbs2jjZXv7b586aNAnSv4= =9uBW -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] socket / over network
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Alan Gauld wrote: > "Nathan McBride" <[EMAIL PROTECTED]> wrote > > Hi Nathan, > > Please don't reply to an existing message to start a new discussion. > It messes up those of us using threaded mail/news readers and > increases the likelihood that your message will be missed. > >> I'm pretty tired of the lame backup solution we have at work. >> Could anyone point me to a (more or less newbieish) example of how >> to >> have python open a socket on one box and get data from it, then have >> another >> box write to it over the network? > > For a very simple example of using a socket you could try the > Network Programming topic in my tutorial. > > There is also a HowTo or Topic guide on the Python web site > that gives a more detailed example. > > That having been said, backups are usually best done using > OS tools or if you must roll your own then using ftp or similar > as a file transfer mechanism rather than trying to send a > bytestream over a socket. ftp can handle broken connections > etc more easily. Detecting and fixing errors over a socket > stream is non trivial and for backups is pretty much essential!! > Going off of wha tyou said, if I choose to use ftp, is there a way i could do everything from within python including the server to get the files? Is there like a ftp module for python to help in the passing of the files between the computers? Thanks, Nate -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFH+YH1/n+duykW6K8RAhv+AJoCDvQip6Q1wJSh3dEoRZoC4Gx3oACdF0DK oQXQTccEnkEz0mf/Qo4Ywqo= =QRMr -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] free loop device
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Hey Guys, I have a program that uses the loop devices. However I originally was finding the free one with: 'losetup -f'. Which returns the next free loop device. :D However, I found that some of the other distros have a version of losetup that does not include that switch. So I am trying to work up another way to get the next device. What I'm figuring is doing 'losetup -a', parsing the returned data, and incrementing it by one... However I don't know how to accomplish this. An example 'losetup -a' would be like this: [EMAIL PROTECTED] Desktop]# losetup -a /dev/loop0: [fd00]:11305639 (enc) /dev/loop1: [fd00]:11306533 (/home/nmcbride/Desktop/xxx.iso) Can anyone give me a hand? Thanks, Nate -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFIH2Oo/n+duykW6K8RAnCTAJ480KREx5udm22wFx3KbNQ08p6AeQCfcfoO IS+ZG3J8M1/oEjcHN/pLhU4= =5zQk -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] free loop device
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Yup, I got some help in IRC. What I ended up doing was using regex to pull out each "/dev/loopX". Then took the X and fed it to max which in turn gave me the highest numbered loop device in use. After which I then just added 1 to X and added it to the end of "/dev/loop_". The only other thing I had to do was put a check in incase there were no used loop devices in which case then it defaults to "/dev/loop0". Works like a charm. :D Nate bob gailer wrote: > Nathan McBride wrote: >> -BEGIN PGP SIGNED MESSAGE- >> Hash: SHA1 >> >> Hey Guys, >> >> I have a program that uses the loop devices. However I originally was >> finding the free one with: >> 'losetup -f'. Which returns the next free loop device. :D However, I >> found that some of the other distros >> have a version of losetup that does not include that switch. So I am >> trying to work up another way to get the >> next device. >> >> What I'm figuring is doing 'losetup -a', parsing the returned data, and >> incrementing it by one... >> However I don't know how to accomplish this. An example 'losetup -a' >> would be like this: >> >> [EMAIL PROTECTED] Desktop]# losetup -a >> /dev/loop0: [fd00]:11305639 (enc) >> /dev/loop1: [fd00]:11306533 (/home/nmcbride/Desktop/xxx.iso) >> >> Can anyone give me a hand? >> > > I for one have no idea how this relates to Python. If others do then they are likely to help you. > -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFIH78C/n+duykW6K8RAuE3AJoDu69W1D7dldLPxXpCfRGuoc++FQCgj2G3 4fG0aSw7fe/noi4hqesG9oA= =vas+ -END PGP SIGNATURE- ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
