如何从shell脚本在Python脚本返回一个值

问题描述：

我有需要从shell脚本值的python脚本。

I have a python script which requires a value from a shell script.

以下是shell脚本（a.sh）：

Following is the shell script (a.sh):

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

return_value

以下是python脚本：

Following is the python script:

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

但它不是working.The错误是导入错误：没有模块名为子。我想我的verison（Python的2.3.4）是pretty岁。有可在这种情况下，??

But its not working.The error is "ImportError : No module named subprocess ". I guess my verison (Python 2.3.4) is pretty old. Is there any substitute for subprocess that can be applied in this case??

答

使用 subprocess.check_output ：

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

这是帮助 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

如何从shell脚本在Python脚本返回一个值

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