I am trying to use output of external program run using the run function.
this program regularly throws a row of data which i need to use in mine script
I have found a subprocess library and used its run()/check_output()
Example:
def usual_process():
# some code here
for i in subprocess.check_output(['foo','$$']):
some_function(i)
Now assuming that foo is already in a PATH variable and it outputs a string in semi-random periods.
I want the program to do its own things, and run some_function(i)every time foo sends new row to its output.
which boiles to two problems. piping the output into a for loop and running this as a background subprocess Thank you
Update: I have managed to get the foo output onto some_function using This
with os.popen('foo') as foos_output:
for line in foos_output:
some_function(line)
According to this os.popen is to be deprecated, but I am yet to figure out how to pipe internal processes in python Now just need to figure out how to run this function in a background
SO, I have solved it.
First step was to start the external script:
proc=Popen('./cisla.sh', stdout=PIPE, bufsize=1)
Next I have started a function that would read it and passed it a pipe
def foo(proc, **args):
for i in proc.stdout:
'''Do all I want to do with each'''
foo(proc).start()`Limitations are:
If your wish t catch scripts error you would have to pipe it in.
second is that it leaves a zombie if you kill parrent SO dont forget to kill child in signal-handling