[BangPypers] Restart when python script hangs
Hello, When I run a python script it hangs at random places. Is there any way to identify when the script hangs and to resume it automatically. When I see that it is not responding i do ^Z (Ctrl -Z) to stop and then use fg command to start it again. I want to automate this. Kindly help me how it can done Regards, Rahul G ___ BangPypers mailing list BangPypers@python.org https://mail.python.org/mailman/listinfo/bangpypers
[BangPypers] Fwd: Python script hangs after using logging module
-- Forwarded message --
From: Rahul Gopan rahulpce...@gmail.com
Date: Tue, May 27, 2014 at 12:06 PM
Subject: Re: [BangPypers] Python script hangs after using logging module
To: Noufal Ibrahim KV nou...@nibrahim.net.in
1. Used subprocess.check_output. . Same result , it hangs
2. Am trying to run a bin file /bin/range branch Begin_No End_No
which is supposed to provide me the number of items available between the
Begin_No and End_No. I guess its not waiting for any input, it works like
charm outside the python code.
3. Running the command outside works file. It hangs only when i use
logging.basicConfig(filename=
'Log_file.log',filemode='w',format='%(asctime)s
%(message)s',level=logging.DEBUG) before executing the command /bin/range
4. Without logging line it works fine so i guess there wont be any issue
with being same directory or environment.
5. Creating the file manually outside the script works. No issue with that.
Help me to resolve this
Regards,
Rahul
On Tue, May 27, 2014 at 10:48 AM, Noufal Ibrahim KV
nou...@nibrahim.net.inwrote:
On Tue, May 27 2014, Rahul Gopan wrote:
#!/usr/local/bin/python2.7
import commands
import subprocess
items = commands.getoutput('COMMAND branch Begin_no End_no | wc
-l')
print items
-- Works --
#!/usr/local/bin/python2.7
import commands
import subprocess
import logging
logging.basicConfig(filename='Log_file.log',filemode='w',format='%(asctime)s
%(message)s',level=logging.DEBUG)
items = commands.getoutput('COMMAND branch Begin_no End_no | wc
-l')
print items
-- Hangs --
A few suggestions.
1. Consider using subprocess or envoy[1] instead of commands. It's
deprecated.
2. Please specify exactly what you're trying to run rather than the
placeholder you've put in your script above. My guess is that it's
waiting for input and holding up the pipeline so that wc is never
run.
3. Try running that command outside to see what the behaviour is.
4. If the command works, make sure that your script is running in the
same directory and with the same environment as the one where the
command works.
5. I'd be inclined to do the `wc` in Python rather than use a pipe. It
looks okay in this case but usually, involving the shell while trying
to execute something leads to headaches with quoting, variable expansion
and other such things that are not worth it.
6. The basicConfig line will actually create and open the Log_file.log
file. If you're on a disk that's misbehaving (e.g. a stale NFS
mount), it might hang. Try creating the file manually outside the
script to see if that's the issue.
[...]
Footnotes:
[1] https://github.com/kennethreitz/envoy
--
Cordially,
Noufal
http://nibrahim.net.in
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[BangPypers] Python script hangs after using logging module
-Original Message-
From: Rahul G ra...@visolve.com
Sent: 26-05-2014 05:41 PM
To: rahulpce...@gmail.com rahulpce...@gmail.com
Subject: Python script hangs after using logging module
Hello,
I tried to make a log file in a python script. After adding the line below
logging.basicConfig(filename='LOG_FILE.log',
filemode='w',
format='%(asctime)s %(message)s',
level=logging.DEBUG)
Now when I try to run a binary file using os.system or commands.getoutput,
script simply hangs. Binary file is supposed to provide me the number of items
available within two numbers in a particular branch
Usage of that command : range branch Begin_number End_number
Without using the above logging line, I could run this command.
I used trace python -m trace --trace myscript.sh to see where exactly it
hangs.Last few lines from the output of trace work of python is
commands.py(58): import os
commands.py(59): pipe = os.popen('{ ' + cmd + '; } 21', 'r')
commands.py(60): text = pipe.read()
Regards,
Rahul
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Re: [BangPypers] Python script hangs after using logging module
#!/usr/local/bin/python2.7
import commands
import subprocess
items = commands.getoutput('COMMAND branch Begin_no End_no | wc -l')
print items
-- Works --
#!/usr/local/bin/python2.7
import commands
import subprocess
import logging
logging.basicConfig(filename='Log_file.log',filemode='w',format='%(asctime)s
%(message)s',level=logging.DEBUG)
items = commands.getoutput('COMMAND branch Begin_no End_no | wc -l')
print items
-- Hangs --
Help me to resolve it
On Mon, May 26, 2014 at 5:42 PM, Rahul Gopan rahulpce...@gmail.com wrote:
--
From: Rahul G ra...@visolve.com
Sent: 26-05-2014 05:41 PM
To: rahulpce...@gmail.com
Subject: Python script hangs after using logging module
Hello,
I tried to make a log file in a python script. After adding the line below
logging.basicConfig(filename='LOG_FILE.log',
filemode='w',
format='%(asctime)s %(message)s',
level=logging.DEBUG)
Now when I try to run a binary file using os.system or commands.getoutput,
script simply hangs. Binary file is supposed to provide me the number of
items available within two numbers in a particular branch
Usage of that command : range branch Begin_number End_number
Without using the above logging line, I could run this command.
I used trace python -m trace --trace myscript.sh to see where exactly it
hangs.Last few lines from the output of trace work of python is
commands.py(58): import os
commands.py(59): pipe = os.popen('{ ' + cmd + '; } 21', 'r')
commands.py(60): text = pipe.read()
Regards,
Rahul
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