os.system questions

Hi;
I have a couple bugs to work out in the below script; namely, I don't know how to capture the result of an os.system command, nor am I convinced that the call to os.system actually results in the execution of the command. Here is the script:

#!/usr/local/bin/python
import re, os

def freshReboot():
up = os.system("uptime")
if re.search('day|hour', up):
pass
else:
first = up
tup = re.split('min', up)
first = tup[0]
n = len(first)
char = first[n-3:n-2]
if re.match(' ', char):
os.system("/usr/local/etc/rc.d/zz_mysql_starter_script.sh")


Here are my problems:

up = os.system("uptime")
How do I assign the output of "uptime" to the variable "up"?

os.system("/usr/local/etc/rc.d/zz_mysql_starter_script.sh")
When I substitute a test variable for "up", I don't get this script to actually run. Everything else is tested and works. Why won't this script run?

TIA,
Eric

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