[Numpy-discussion] Allow for callable in indexing

2021-11-24 Thread cameron . pinnegar 
If you have an array built up out of method chaining, sometimes you need to 
filter it at the very end. This can be annoying because it means you have to 
create a temporary variable just so you can refer to it in the indexing square 
brackets:

_temp = long_and_complicated_expression()
result = _temp[_temp >= 0]

You could also use the walrus operator but this is odd looking and it still 
pollutes the namespace:

result = (_temp := long_and_complicated_expression())[_temp >= 0]

What I would like is to be able to use a lambda inside the indexing square 
brackets, which would take the whole array as an argument and give a boolean 
array:

result = long_and_complicated_expression()[lambda arr: arr >= 0]

I should emphasize, the lambda gets the entire array as its argument, and 
returns an entire mask array of bools. It isn't like the `map` and `filter` 
builtins where it would call the python function once for each element and thus 
be slow.

Pandas already has something similar[1]; you can pass a lambda into `.loc[]` 
that takes a Series and returns a boolean indexer.

[1] 
https://pandas.pydata.org/pandas-docs/version/0.18.1/whatsnew.html#method-chaininng-improvements
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[Numpy-discussion] ANN: SciPy 1.7.3

2021-11-24 Thread Tyler Reddy 
Hi all,

On behalf of the SciPy development team, I'm pleased to announced the
release of SciPy 1.7.3,
which is a bug fix release that includes wheels for MacOS 12+ arm64 at
Python versions 3.8, 3.9, and 3.10.

Sources and binary wheels can be found at:
https://pypi.org/project/scipy/
and at: https://github.com/scipy/scipy/releases/tag/v1.7.3



One of a few ways to install this release with pip:

pip install scipy==1.7.3

=
SciPy 1.7.3 Release Notes
=

SciPy 1.7.3 is a bug-fix release that provides binary wheels
for MacOS arm64 with Python 3.8, 3.9, and 3.10. The MacOS arm64 wheels
are only available for MacOS version 12.0 and greater, as explained
in Issue 14688, linked below.

Authors
==

* Anirudh Dagar
* Ralf Gommers
* Tyler Reddy
* Pamphile Roy
* Olivier Grisel
* Isuru Fernando

A total of 6 people contributed to this release.
People with a "+" by their names contributed a patch for the first time.
This list of names is automatically generated, and may not be fully
complete.

Issues closed for 1.7.3
---

* `#13364 `__: Segmentation
fault on import of scipy.integrate on Apple M1 ARM...
* `#14688 `__: BUG: ARPACK's
eigsh & OpenBLAS from Apple Silicon M1 (arm64)...
* `#14991 `__: four CI
failures on pre-release job
* `#15077 `__: Remaining test
failures for macOS arm64 wheel
* `#15081 `__: BUG:
Segmentation fault caused by scipy.stats.qmc.qmc.update_discrepancy


Pull requests for 1.7.3
--

* `#14990 `__: BLD: update
pyproject.toml for Python 3.10 changes
* `#15086 `__: BUG: out of
bounds indexing in stats.qmc.update_discrepancy
* `#15090 `__: MAINT: skip a few
failing tests in \`1.7.x\` for macOS arm64

Checksums
=

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