如何从python脚本中的shell脚本返回值

我有一个python脚本,它需要shell脚本中的值.
以下是外壳程序脚本(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")
但是它不起作用.错误是“ ImportError:没有名为子进程的模块”.我猜我的版本(Python 2.3.4)很老了.在这种情况下,是否可以替代子流程?
解决方法:
使用subprocess.check_output:
import subprocess
answer = subprocess.check_output(['./a.sh'])
print("the answer is {}".format(answer))
有关subprocess.check_output的帮助:
>>> 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