bash - I am trying to send mail in python using shell command . But variable does not get substituted in script -

import subprocess ='xxxx@fmr.com' subject= 'hostname' cmd= "cat /var/log | mailx -s 'swap full on'+subject" +to subprocess.popen(cmd,shell=true) 

if place double quote before subject mailx takes first character subject , treat other recipient , try send mail them .

--------------------out put of cmd= "cat /var/log | mailx -s 'swap full on'"+subject +to

can try this:

import subprocess ='xxxx@fmr.com' cmd= "cat /var/log | mailx -s 'test' " + subprocess.popen(cmd,shell=true)