Commits
Wes McKinney authored 2aed7845fbc
ARROW-765: [Python] Add more natural Exception type hierarchy for thirdparty users I also took the liberty of changing a number of error types in libarrow_python Author: Wes McKinney <wes.mckinney@twosigma.com> Closes #489 from wesm/ARROW-765 and squashes the following commits: 74c43df [Wes McKinney] Make a nicer Exception hierachy, with more intuitive bases for thirdparty users 2a58a1b [Wes McKinney] Add a nicer exception hierarchy. Unknown errors return as ValueError