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Just discovered that Travis is broken on master branch from #7 and verified on my forked copy https://travis-ci.org/hsiaoyi0504/rdkit-tutorials/builds/318822113. Therefore, I fix the issue through this. This travis is passed now: https://travis-ci.org/hsiaoyi0504/rdkit-tutorials/builds/318850786
@greglandrum Can you review this ? Therefore, we can check if #7 is ready to be merged.