使用 Python 的 subprocess
模块和 communicate()
方法时如何检索退出代码?
How do I retrieve the exit code when using Python's subprocess
module and the communicate()
method?
相关代码:
import subprocess as sp
data = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE).communicate()[0]
我应该换一种方式吗?
Popen.communicate
将在完成时设置 returncode
属性(*).以下是相关文档部分:
Popen.communicate
will set the returncode
attribute when it's done(*). Here's the relevant documentation section:
Popen.returncode
The child return code, set by poll() and wait() (and indirectly by communicate()).
A None value indicates that the process hasn’t terminated yet.
A negative value -N indicates that the child was terminated by signal N (Unix only).
所以你可以这样做(我没有测试它,但它应该可以工作):
So you can just do (I didn't test it but it should work):
import subprocess as sp
child = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE)
streamdata = child.communicate()[0]
rc = child.returncode
<小时>
(*) 发生这种情况是因为它的实现方式:在设置线程来读取孩子的流之后,它只是调用 wait
.
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