passing double quotes in subprocess
4kir4.1i at gmail.com
Tue Sep 8 13:15:55 CEST 2015
loial <jldunn2000 at gmail.com> writes:
> I need to execute an external shell script via subprocess on Linux.
> One of the parameters needs to be passed inside double quotes
> But the double quotes do not appear to be passed to the script
> I am using :
> myscript = '/home/john/myscript'
> commandline = myscript + ' ' + '\"Hello\"'
> process = subprocess.Popen(commandline, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
> output,err = process.communicate()
> if I make the call from another shell script and escape the double
> quotes it works fine, but not when I use python and subprocess.
> I have googled this but cannot find a solution...is there one?
You don't need shell=True here:
from subprocess import Popen, PIPE
cmd = ['/home/john/myscript', 'Hello'] # if myscript don't need quotes
# cmd = ['/home/john/myscript', '"Hello"'] # if myscript does need quotes
with Popen(cmd, stdout=PIPE, stderr=PIPE) as process:
output, errors = process.communicate()
In general, to preserve backslashes, use raw-string literals:
>>> '\"' == '"'
>>> r'\"' == '\\"'
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