Re: [Tutor] cgi script to start another process in background
Ravi Kondamuru wrote: Hi, I am trying to write a python cgi script, that invokes another process and exists. Using the subprocess documentation on NO_WAIT, I am not having much success: pid = os.spawnlp(os.P_NOWAIT, "/bin/mycmd", "mycmd", "myarg") ==> pid = Popen(["/bin/mycmd", "myarg"]).pid The script seems to wait for the new process to exit before returning to the user. I tried doing the double-fork approach discussed here: http://code.activestate.com/recipes/66012/ Are you on some kind of Unix box here? The fork approach should definitely work for you. An even simpler example, which should still work for you, is here: import os , time , sys print 'hello before the fork' if os.fork(): print 'parent exiting' sys.exit() print 'hello from child: %d' % os.getpid() time.sleep(30) os._exit(0) You should be able to verify that you have that process still running after the main process exits. -- Jay Deiman \033:wq! ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] passig parameter with CGI...
Spencer Parker wrote:
I am looking for a little instruction on how one would process a set of
parameters being sent to it through CGI. I have a script that sends
info to another script that lives on another server. The second script
would then process the information that is passed to it through a
parameters list in a URL. It would then trigger the script to do some
things via XMLRPC. I have the portion that connects to the XMLRPC
server, but not the 1st part. I can send it a list of command line
parameters, but the spec has changed. We want to do it with just curl
and send it parameters with a URL string. Not really looking for direct
code...just some ideas on how this is done for the most part. I looked
around, but nothing really fit what I wanted...mostly form
processing...thanks!
I assume the receiving script is going to be a cgi or something like
that. It sounds like all you want to do here is construct a GET request
to send to a web server.
=
import urllib
options = {'optone': '1' , 'opttwo': '2' , 'optthree': '3'}
url = 'http://www.example.com/path/to/script.cgi?%s' % \
urllib.urlencode(options)
u = urllib.urlopen(url)
# Here you can read the response if needs be
response = u.read()
u.close()
=
That's about it.
--
Jay Deiman
\033:wq!
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Re: [Tutor] concatenating files
Bala subramanian wrote:
Hai,
I have file1.dat,file2.dat...file 300.dat in one directory. I want to
concatenate all the files in a single file (total.dat) with a string
"END" separating the file contents.
my total.dat should be
file1.dat contents
END
file2.dat contents
END
file300.dat.
now i have another 400 such *.dat files in another directory whose
contents i hve to append to "total.dat", how can i do this task. i need
to do something like, updating the file total.dat without overwritting it.
Thanks,
Bala
This should about do it:
-
#!/usr/bin/env python
import sys , os , glob
startDir = ''
totalFile = '/path/to/total.dat'
if len(sys.argv) > 1 and os.path.isdir(sys.argv[1]):
startDir = sys.argv[1]
else:
print 'Usage: %s ' % os.path.basename(sys.argv[0])
sys.exit(1)
tfh = open(totalFile , 'a')
for f in glob.glob(os.path.join(startDir , '*.dat')):
tfh.write('%s contents\n' % f)
tfh.write(open(f).read())
tfh.write('\nEND\n')
tfh.close()
-
All you have to do is set "totalFile" to your main output file and then
call the script as "scriptname.py /path/to/datfile/directory".
--
Jay Deiman
\033:wq!
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Re: [Tutor] rrdtool examples.
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Jeremiah Jester wrote:
> Is anyone on here using the python-rrdtool module for graphing and
> analysis? If so, do you have some sample scripts you could show me.
> There doesn't seem to be a lot out there as far as real world python
> examples.
>
> Thanks,
> JJ
Actually, I was just playing around with the rrdtool library for python
last week. It turns out that you basically just use the command line
options as options for the different method calls (like create()). All
you really have to do is check out the man pages for rrdtool to have all
the documentation you need for the rrdtool python module. You literally
pass in the command line opts just as they would appear on the command
line. Here is a quick little script that I whipped up for playing purposes:
-
#!/usr/bin/env python
import rrdtool , time , random
stime = int(time.time()) - 5 * 86400
dpoints = 1000
etime = stime + (dpoints * 300)
fname = 'test.rrd'
gfname = 'test.png'
rrdtool.create('test.rrd' ,
'--start' , str(stime) ,
'DS:speed:COUNTER:600:U:U' ,
'RRA:AVERAGE:0.5:1:576' ,
'RRA:AVERAGE:0.5:6:336'
)
ctime = stime
cmiles = 0
for i in xrange(dpoints):
bump = random.randint(1 , 20)
cmiles += bump
ctime += 300
rrdtool.update(fname , '%d:%d' % (ctime , cmiles))
rrdtool.graph(gfname ,
'--start' , str(etime - (24 * 3600)) ,
'--end' , str(etime) ,
'--vertical-label' , 'Speed m/h' ,
'--imgformat' , 'PNG' ,
'--title' , 'Speeds' ,
'--lower-limit' , '0' ,
'DEF:myspeed=%s:speed:AVERAGE' % fname ,
'CDEF:mph=myspeed,3600,*' ,
'VDEF:msmax=mph,MAXIMUM' ,
'VDEF:msavg=mph,AVERAGE' ,
'VDEF:msmin=mph,MINIMUM' ,
'VDEF:mspct=mph,95,PERCENT' ,
'LINE1:mph#FF:My Speed' ,
r'GPRINT:msmax:Max\: %6.1lf mph' ,
r'GPRINT:msavg:Avg\: %6.1lf mph' ,
r'GPRINT:msmin:Min\: %6.1lf mph\l' ,
r'GPRINT:mspct:95th Perc\: %6.1lf mph\l'
)
-
That, coupled with the rrdtool man pages (which are very good, complete
with examples) should be enough to get you started.
- --
Jay Deiman
\033:wq!
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