I have a simple Python script which will execute a shell script using subprocess
mdoule in Python.
Below is my Python shell script which is calling testing.sh
shell script and it works fine.
import os
import json
import subprocess
jsonData = '{"pp": [0,3,5,7,9], "sp": [1,2,4,6,8]}'
jj = json.loads(jsonData)
print jj['pp']
print jj['sp']
os.putenv( 'jj1', 'Hello World 1')
os.putenv( 'jj2', 'Hello World 2')
os.putenv( 'jj3', ' '.join( str(v) for v in jj['pp'] ) )
os.putenv( 'jj4', ' '.join( str(v) for v in jj['sp'] ) )
print "start"
subprocess.call(['./testing.sh'])
print "end"
And below is my shell script -
#!/bin/bash
for el1 in $jj3
do
echo "$el1"
done
for el2 in $jj4
do
echo "$el2"
done
for i in $( david ); do
echo item: $i
done
Now the question I have is -
if you see my Python script, I am printing start
, then executing shell script and then printing end
.. So suppose for whatever reason that shell script which I am executing has any problem, then I don't want to print out end
.
So in the above example, shell script will not run properly as david
is not a linux command so it will throw an error. So how should I see the status of entire bash shell script and then decide whether I need to print end
or not?
I have just added a for loop example, it can be any shell script..
Is it possible to do?
Just use the returned value from call()
:
import subprocess
rc = subprocess.call("true")
assert rc == 0 # zero exit status means success
rc = subprocess.call("false")
assert rc != 0 # non-zero means failure
You could use check_call()
to raise an exception automatically if the command fails instead of checking the returned code manually:
rc = subprocess.check_call("true") # <-- no exception
assert rc == 0
try:
subprocess.check_call("false") # raises an exception
except subprocess.CalledProcessError as e:
assert e.returncode == 1
else:
assert 0, "never happens"
Well, according to the docs , .call will return the exit code back to you. You may want to check that you actually get an error return code, though. (I think the for loop will still return a 0 code since it more-or-less finished.)
You can check stderr of the bash script rather than return code.
proc = subprocess.Popen('testing.sh', stdout=subprocess.PIPE, stderr=subprocess.PIPE)
(stdout, stderr) = proc.communicate()
if stderr:
print "Shell script gave some error"
else:
print "end" # Shell script ran fine.
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.