I'm please to announce the NumPy 1.13.0rc1 release. This release supports Python 2.7 and 3.4-3.6 and contains many new features. It is one of the most ambitious releases in the last several years. Some of the highlights and new functions are

Highlights

• Operations like ``a + b + c`` will reuse temporaries on some platforms, resulting in less memory use and faster execution.
• Inplace operations check if inputs overlap outputs and create temporaries to avoid problems.
• New __array_ufunc__ attribute provides improved ability for classes to override default ufunc behavior.
•  New np.block function for creating blocked arrays.

New functions

• New ``np.positive`` ufunc.
• New ``np.divmod`` ufunc provides more efficient divmod.
• New ``np.isnat`` ufunc tests for NaT special values.
• New ``np.heaviside`` ufunc computes the Heaviside function.
• New ``np.isin`` function, improves on ``in1d``.
• New ``np.block`` function for creating blocked arrays.
• New ``PyArray_MapIterArrayCopyIfOverlap`` added to NumPy C-API.

Wheels for the pre-release are available on PyPI. Source tarballs, zipfiles, release notes, and the Changelog are available on github.