how to call python variables inside bash commands or can I do that?

Question

I am trying to list cronjobs of all users
user_file = open('/root/pys/userdomains', 'r')
for line in user_file:
print line
splitted_line = line.split(': ')
print splitted_line
user_cron = splitted_line[1].split()
print user_cron
print "crons for", user_cron, "is",
CronTab(user=user_cron)

On last line, can I use os.system('crontab -l -u user_cron') to get similar result. I know there is CronTab option, but in similar cases can I use python variables inside bash commands

Answer 1

Sure you can use variables inside command.

import os

ip_add = '127.0.0.1'

#use one of next examples
os.system('ping %s' % ip_add)
os.system('ping {}'.format(ip_add))
os.system('ping ' + str(ip_add))