module 'os' has no attribute 'popen3' under Python 3

Asked by Luc Saffre

Here is a traceback where appy fails under Python 3:
https://travis-ci.org/lino-framework/welfare/jobs/277350481

The os.popen3() function is obsolete and should be replaced by subprocess module:
https://docs.python.org/2/library/os.html#os.popen3

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Launchpad Janitor (janitor) said :
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