如何从python脚本中的shell脚本返回值

Question

我有一个python脚本,需要来自shell脚本的值.

以下是shell脚本(a.sh):

#!/bin/bash
return_value(){
  value=$(///some unix command)
  echo "$value"
}

return_value

以下是python脚本:

Import subprocess
answer = Subprocess.call([‘./a.sh’])
print("the answer is %s % answer")  

但它不工作.错误是"ImportError:没有名为subprocess的模块".我想我的verison(Python 2.3.4)已经很老了.在这种情况下,是否可以替代可以应用的子进程？

Answer 1

用途subprocess.check_output:

import subprocess
answer = subprocess.check_output(['./a.sh'])
print("the answer is {}".format(answer))

帮助subprocess.check_output:

>>> print subprocess.check_output.__doc__
Run command with arguments and return its output as a byte string.

演示:

>>> import subprocess
>>> answer = subprocess.check_output(['./a.sh'])
>>> answer
'Hello World!\n'
>>> print("the answer is {}".format(answer))
the answer is Hello World!

a.sh :

#!/bin/bash
STR="Hello World!"
echo $STR