python - Python os.popen : How to ensure popen(…) has completed execution before continuing?

Question

我有以下代码:

pwd = '/home/user/svnexport/Repo/'

updateSVN = "svn up " + pwd
cmd = os.popen(updateSVN)

getAllInfo = "svn info " + pwd + "branches/* " + pwd + "tags/* " + pwd + "trunk/*"
cmd = os.popen(getAllInfo)

在cmd = os.popen(updateSVN)开始执行之前，如何确定cmd = os.popen(getAllInfo)已经完成执行？

Answer 1

您应该使用subprocess:

import subprocess
import glob
pwd = '/home/user/svnexport/Repo/'

updateSVN = ["svn", "up", pwd]
cmd = subprocess.Popen(updateSVN)
status = cmd.wait()

# the same can be achieved in a shorter way:
filelists = [glob.glob(pwd + i + "/*") for i in ('branches', 'tags', 'trunk')]
filelist = sum(filelists, []) # add them together

getAllInfo = ["svn", "info"] + filelist
status = subprocess.call(getAllInfo)

如果您需要捕获子流程的输出，请执行

process = subprocess.Popen(..., stdout=subprocess.PIPE)
data = process.stdout.read()
status = subprocess.wait()