How do you execute external programs from Python?

[Carl]

Hi,

I have this little code snippet that I use for recording audio streams. My
problem is that I want to schedule my recordings with crontab. This does
not work, however. I cannot figure out why; my code works fine when run
manually from the command prompt.

On final thing: What would be the best way to turn off the recording?

Can someone help me?

Carl


Here is my code:

import time
import os
import shutil

URL = "http://www.jazzandblue s.org/listen/links/kkjz1.ram"

def RecordURL(what = "KKJZ"):
str_mplayer = "mplayer -playlist " + URL
str_mplayer += " -ao pcm -aofile "
str_mplayer += what + ".wav" + " -vc dummy -vo null"
os.system(str_m player)

def CreateOGG(what = "KKJZ"):
ogg_file = what + ".ogg"
str_oggenc = "oggenc " + what + ".wav"
os.system(str_o ggenc)

def CreateMP3(what = "KKJZ"):
mp3_file = what + ".mp3"
str_lame = "lame " + what + ".wav " + mp3_file
os.system(str_l ame)

def DeleteWAV(what = "KKJZ"):
wav_file = what + ".wav"
str_rm = "rm " + wav_file
os.system(str_r m)

def DateTag(what = "KKJZ"):
local_time = time.asctime(ti me.localtime())
for local_file in [ what + ".ogg", what + ".mp3" ]:
length = len(local_file)
local_file_copy = local_file[: length - 4] + "_" + local_time + "."
+ local_file[length - 3 :]
shutil.copy(loc al_file, local_file_copy )

RecordURL()
## CreateOGG()
## CreateMP3()
## DeleteWAV()
## DateTag()

Here is my crontab entry:

30 * * * * python -c "import os; os.chdir('/home/alpha/mymusic/P2/Jazz/');
import KKJZ"

[Jean Brouwers]

Re: How do you execute external programs from Python?


You did not mentions what specific part is not working under cron, so
here is a guess.

Maybe the PATH environment variable is not set correctly such that
binaries like mplayer can not be found.

Try using absolute path names for mplayer and any other files.

/Jean Brouwers


In article <iGppd.2045$3N5 .117@amstwist00 >, Carl
<phleum_nospam@ chello.se> wrote:
[color=blue]
> Hi,
>
> I have this little code snippet that I use for recording audio streams. My
> problem is that I want to schedule my recordings with crontab. This does
> not work, however. I cannot figure out why; my code works fine when run
> manually from the command prompt.
>
> On final thing: What would be the best way to turn off the recording?
>
> Can someone help me?
>
> Carl
>
>
> Here is my code:
>
> import time
> import os
> import shutil
>
> URL = "http://www.jazzandblue s.org/listen/links/kkjz1.ram"
>
> def RecordURL(what = "KKJZ"):
> str_mplayer = "mplayer -playlist " + URL
> str_mplayer += " -ao pcm -aofile "
> str_mplayer += what + ".wav" + " -vc dummy -vo null"
> os.system(str_m player)
>
> def CreateOGG(what = "KKJZ"):
> ogg_file = what + ".ogg"
> str_oggenc = "oggenc " + what + ".wav"
> os.system(str_o ggenc)
>
> def CreateMP3(what = "KKJZ"):
> mp3_file = what + ".mp3"
> str_lame = "lame " + what + ".wav " + mp3_file
> os.system(str_l ame)
>
> def DeleteWAV(what = "KKJZ"):
> wav_file = what + ".wav"
> str_rm = "rm " + wav_file
> os.system(str_r m)
>
> def DateTag(what = "KKJZ"):
> local_time = time.asctime(ti me.localtime())
> for local_file in [ what + ".ogg", what + ".mp3" ]:
> length = len(local_file)
> local_file_copy = local_file[: length - 4] + "_" + local_time + "."
> + local_file[length - 3 :]
> shutil.copy(loc al_file, local_file_copy )
>
> RecordURL()
> ## CreateOGG()
> ## CreateMP3()
> ## DeleteWAV()
> ## DateTag()
>
> Here is my crontab entry:
>
> 30 * * * * python -c "import os; os.chdir('/home/alpha/mymusic/P2/Jazz/');
> import KKJZ"
>
>[/color]

[michael]

Re: How do you execute external programs from Python?

> > Here is my crontab entry:[color=blue][color=green]
> >
> > 30 * * * * python -c "import os; os.chdir('/home/alpha/mymusic/P2/Jazz/');
> > import KKJZ"[/color][/color]

Hi,

if cron is running as root say

30 * * * * "su - user; script.sh"

su - user means that .profile, .bash-profile etc is read. I think its
an "Environmen tal" Problem

[Carl]

Re: How do you execute external programs from Python?

Carl wrote:
[color=blue]
> Hi,
>
> I have this little code snippet that I use for recording audio streams. My
> problem is that I want to schedule my recordings with crontab. This does
> not work, however. I cannot figure out why; my code works fine when run
> manually from the command prompt.
>
> On final thing: What would be the best way to turn off the recording?
>
> Can someone help me?
>
> Carl
>
>
> Here is my code:
>
> import time
> import os
> import shutil
>
> URL = "http://www.jazzandblue s.org/listen/links/kkjz1.ram"
>
> def RecordURL(what = "KKJZ"):
> str_mplayer = "mplayer -playlist " + URL
> str_mplayer += " -ao pcm -aofile "
> str_mplayer += what + ".wav" + " -vc dummy -vo null"
> os.system(str_m player)
>
> def CreateOGG(what = "KKJZ"):
> ogg_file = what + ".ogg"
> str_oggenc = "oggenc " + what + ".wav"
> os.system(str_o ggenc)
>
> def CreateMP3(what = "KKJZ"):
> mp3_file = what + ".mp3"
> str_lame = "lame " + what + ".wav " + mp3_file
> os.system(str_l ame)
>
> def DeleteWAV(what = "KKJZ"):
> wav_file = what + ".wav"
> str_rm = "rm " + wav_file
> os.system(str_r m)
>
> def DateTag(what = "KKJZ"):
> local_time = time.asctime(ti me.localtime())
> for local_file in [ what + ".ogg", what + ".mp3" ]:
> length = len(local_file)
> local_file_copy = local_file[: length - 4] + "_" + local_time +
> "."
> + local_file[length - 3 :]
> shutil.copy(loc al_file, local_file_copy )
>
> RecordURL()
> ## CreateOGG()
> ## CreateMP3()
> ## DeleteWAV()
> ## DateTag()
>
> Here is my crontab entry:
>
> 30 * * * * python -c "import os; os.chdir('/home/alpha/mymusic/P2/Jazz/');
> import KKJZ"[/color]

Thanks guys!

It was an environmental problem. It works now; the only thing I still
haven't solved is how to kill the spawned process after say an hour. Any
clues?

Carl

[Paul Watson]

Re: How do you execute external programs from Python?

"Carl" <phleum_nospam@ chello.se> wrote in message
news:e_1qd.2176 $3N5.2001@amstw ist00...[color=blue]
> Carl wrote:
>
> Thanks guys!
>
> It was an environmental problem. It works now; the only thing I still
> haven't solved is how to kill the spawned process after say an hour. Any
> clues?
>
> Carl[/color]

Have you investigated... ?

os.spawn*()
os.P_NOWAIT
os.kill()