bash 如何从python脚本中的shell脚本返回值
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How to return a value from a shell script in a python script
提问by user2475677
I have a python script which requires a value from a shell script.
我有一个需要来自 shell 脚本的值的 python 脚本。
Following is the shell script (a.sh):
以下是 shell 脚本 (a.sh)：
#!/bin/bash
return_value(){
value=$(///some unix command)
echo "$value"
}
return_value
Following is the python script:
以下是python脚本：
Import subprocess
answer = Subprocess.call([‘./a.sh'])
print("the answer is %s % answer")
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??
但它不起作用。错误是“ImportError：No module named subprocess”。我想我的版本（Python 2.3.4）已经很旧了。在这种情况下，是否可以替代子流程？
回答by Ashwini Chaudhary
Use subprocess.check_output:
使用subprocess.check_output：
import subprocess
answer = subprocess.check_output(['./a.sh'])
print("the answer is {}".format(answer))
help on subprocess.check_output:
帮助subprocess.check_output：
>>> print subprocess.check_output.__doc__
Run command with arguments and return its output as a byte string.
Demo:
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:
a.sh：
#!/bin/bash
STR="Hello World!"
echo $STR
回答by Krab
use Subprocess.check_outputinstead of Subprocess.call.
使用Subprocess.check_output而不是 Subprocess.call。
Subprocess.callreturns return code of that script.
Subprocess.check_outputreturns byte stream of script output.
Subprocess.call返回该脚本的返回码。
Subprocess.check_output返回脚本输出的字节流。
