在调用process. communication()之后使用process.wait()。 例如:

import subprocess

process = subprocess.Popen(['ipconfig', '/all'], stderr=subprocess.PIPE, stdout=subprocess.PIPE)
stdout, stderr = process.communicate()
exit_code = process.wait()
print(stdout, stderr, exit_code)

当它完成时，popen . communication将设置returncode属性(*)。以下是相关文档部分:

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，但它应该工作):

import subprocess as sp
child = sp.Popen(openRTSP + opts.split(), stdout=sp.PIPE)
streamdata = child.communicate()[0]
rc = child.returncode

(*)发生这种情况是因为它的实现方式:在设置线程来读取子流之后，它只调用wait。

Exitcode = data.wait()。如果子进程写入标准输出/错误，和/或从标准输入读取，并且没有对等点，则子进程将被阻塞。

这对我很管用。它还打印子进程返回的输出

child = subprocess.Popen(serial_script_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    retValRunJobsSerialScript = 0
    for line in child.stdout.readlines():
        child.wait()
        print line           
    retValRunJobsSerialScript= child.returncode

首先，您应该确保进程已经完成运行，并且已经使用.wait方法读取了返回代码。这将返回代码。如果你以后想要访问它，它被存储为Popen对象中的.returncode。

请看评论。

代码:

import subprocess


class MyLibrary(object):

    def execute(self, cmd):
        return subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, universal_newlines=True,)
      
    def list(self):
        command = ["ping", "google.com"]
        sp = self.execute(command)
        status = sp.wait()  # will wait for sp to finish
        out, err = sp.communicate()
        print(out)
        return status # 0 is success else error


test = MyLibrary()

print(test.list())

输出:

C:\Users\shita\Documents\Tech\Python>python t5.py

Pinging google.com [142.250.64.78] with 32 bytes of data:
Reply from 142.250.64.78: bytes=32 time=108ms TTL=116
Reply from 142.250.64.78: bytes=32 time=224ms TTL=116
Reply from 142.250.64.78: bytes=32 time=84ms TTL=116
Reply from 142.250.64.78: bytes=32 time=139ms TTL=116

Ping statistics for 142.250.64.78:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 84ms, Maximum = 224ms, Average = 138ms

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