[Tutor] how popen works? (original) (raw)
Alan Gauld alan.gauld at blueyonder.co.uk
Thu Jul 22 00:38:08 CEST 2004
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To restart the database I call, via popen, a SQLPlus script, this script takes about 90 seconds to execute. I thought that Python at the popoen line would wait until the SQLPlus script was finished and then continue with the next line of code.
Normally it would unless the command itself is set to run in the background.
Am I not understanding what popen does or is there a parameter I need to send to it to pause until it is finished, or is there a better way of "shelling" out to the OS and exeuting commands.
popen() is used where you need to read the output of the command. If you just need the return code from the command then os.system() is easier to use.
in this I create a cmd window and with the /c tell it to close after sqlplus is finished
syncCommand = 'cmd /c sqlplus /nolog @%s' %(localccf) pipeFile = os.popen("%s" %str(syncCommand))
This would be easier with:
pipefile = popen(syncCommand)
The extra level of string formatting and conversion is doing nothing useful.
Also to read the results of the command you will need to read the results of popen like
output = pipefile.read()
Dunno if that helps...
Alan G
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