The Python versions supported for this release are 3.7-3.9. The 1.21.x series is compatible with development Python 3.10 and Python 3.10 will be officially supported after it is released. Wheels can be downloaded from PyPI; source archives, release notes, and wheel hashes are available on Github. Linux users will need pip >= 0.19.3 in order to install manylinux2010 and manylinux2014 wheels.

Contributors

A total of 11 people contributed to this release. People with a \"+\" by
their names contributed a patch for the first time.

• Bas van Beek
• Charles Harris
• Ganesh Kathiresan
• Gregory R. Lee
• Hugo Defois +
• Kevin Sheppard
• Matti Picus
• Ralf Gommers
• Sayed Adel
• Sebastian Berg
• Thomas J. Fan

Pull requests merged

A total of 26 pull requests were merged for this release.

• #19311: REV,BUG: Replace `NotImplemented` with `typing.Any`
• #19324: MAINT: Fixed the return-dtype of `ndarray.real` and `imag`
• #19330: MAINT: Replace `"dtype[Any]"` with `dtype` in the definiton of\...
• #19342: DOC: Fix some docstrings that crash pdf generation.
• #19343: MAINT: bump scipy-mathjax
• #19347: BUG: Fix arr.flat.index for large arrays and big-endian machines
• #19348: ENH: add `numpy.f2py.get_include` function
• #19349: BUG: Fix reference count leak in ufunc dtype handling
• #19350: MAINT: Annotate missing attributes of `np.number` subclasses
• #19351: BUG: Fix cast safety and comparisons for zero sized voids
• #19352: BUG: Correct Cython declaration in random
• #19353: BUG: protect against accessing base attribute of a NULL subarray
• #19365: BUG, SIMD: Fix detecting AVX512 features on Darwin
• #19366: MAINT: remove `print()`\'s in distutils template handling
• #19390: ENH: SIMD architectures to show\_config
• #19391: BUG: Do not raise deprecation warning for all nans in unique\...
• #19392: BUG: Fix NULL special case in object-to-any cast code
• #19430: MAINT: Use arm64-graviton2 for testing on travis
• #19495: BUILD: update OpenBLAS to v0.3.17
• #19496: MAINT: Avoid unicode characters in division SIMD code comments
• #19499: BUG, SIMD: Fix infinite loop during count non-zero on GCC-11
• #19500: BUG: fix a numpy.npiter leak in npyiter\_multi\_index\_set
• #19501: TST: Fix a `GenericAlias` test failure for python 3.9.0
• #19502: MAINT: Start testing with Python 3.10.0b3.
• #19503: MAINT: Add missing dtype overloads for object- and ctypes-based\...
• #19510: REL: Prepare for NumPy 1.21.1 release.

Charles Harris