On 02/12/2013 05:38 AM, Bqsj Sjbq wrote:
>>> import os
>>> os.system("i=3")
0
>>> os.system("echo $i")
0
why i can not get the value of i?
First:
os.system is only defined to give the return value (exit code) of the
sub-process.
However, one way to get the output of shell commands is to use subprocess.
import subprocess
x = subprocess.check_output( [ "echo", "3,5,7" ] )
However, bash built-ins are not executables; nor is shell expansion
performed; so you will actually need to do something like:
x=subprocess.check_output( [ "bash", "-c", "i=3; echo $i" ] )
>>> x
>>> '3\n'
To get the result you're interested in.
There may be better ways to get the result you want.... but hopefully
you understand the problem better.
:)
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