MAINT: Fix ResourceWarning new in Python 3.6. #8178
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In Python 2.6 the process destructor emits a ResourceWarning if the process has not terminated when destruction occurs. Fix by calling the wait method before return. The Popen class may be used as a context manager in Python 3.2+, unfortunately that does not include 2.7.
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In Python 2.6 the process destructor emits a ResourceWarning if the process has not terminated when destruction occurs. Fix by calling the wait method before return.
The Popen class may be used as a context manager in Python 3.2+, unfortunately that does not include 2.7.
Also add testing with Python 3.6-dev.