Martin Panter added the comment:
I tried out your code on the webbrowser module, and it does raise a warning:
>>> import webbrowser
>>> b = webbrowser.get("chromium")
>>> b.open("https://bugs.python.org/issue26741";)
/home/proj/python/cpython/Lib/subprocess.py:1011: ResourceWarning: running
subprocess <subprocess.Popen object at 0x7f1ef31c90c0>
source=self)
True
At this point, the Python interpreter has a child process “chromium” which is
left as a zombie when it exits. I guess the easiest solution (at least for
Unix) would be to spawn an intermediate launcher process that exited after
launching the web browser process.
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<http://bugs.python.org/issue26741>
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