CODEWITHSUNDEEP
pythonloopsprocessmultiprocessing
sjm1983
sjm1983

Reputation: 1

looping external commands in python

I'm trying to run a simple set of command line calls to a custom app, within a loop.

i.e.

list=['set1','set2','set3','set4']
ExternCmd = (myapp + ' ' + arg1 + ' ' + arg2 ' -v ')
for item in list:
    arg1 = item
    self.process.start(ExternCmd)
    self.process.waitForFinished(-1)

But I dont get sets 2 - 4 processed, only the first.

I tried adding a self.process.join() to get the loop to wait for the current set to finish processing,but I get the following error: 

AttributeError: 'QProcess' object has no attribute 'join'

any help would be great getting my processes to work in order. I would ideally like them to be processed one after the other - rather than all at the same time.

thanks

EDIT: I put the ExternCmd in the wrong place for this example. My code should be:

list=['set1','set2','set3','set4']
for item in list:
    arg1 = item
    ExternCmd = (myapp + ' ' + arg1 + ' ' + arg2 ' -v ')

    self.process.start(ExternCmd)
    self.process.waitForFinished(-1)

This is still failing to run the command on anything other than Set1

Upvotes: 0

Views: 51

Answers (1)

Ryan
Ryan

Reputation: 2084

Changing the args isn't changing ExternCmd. You need to set that in the loop, for example:

list=['set1','set2','set3','set4']
for item in list:
    ExternCmd = (myapp + ' ' + item + ' -v ')
    self.process.start(ExternCmd)
    self.process.waitForFinished(-1)

Upvotes: 1

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