Test added and patch to fix python-version-dependent issues when len ro... #9583
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...w/col_levels is 1.
The docs for sparse to_coo methods failed to build. There was some case (row_levels len 1) that failed in python 2.7 only that I failed to test (and I have been building docs in python 3). Have added test and patched. Also needed to expand the interator (list(map(... ) in the "# squish" line as there was some tupleizing differences between python 3 and 2.
Perhaps there is a better way to avoid these issues? Waiting for Travis.