ENH: Implementation of the NEP 47 (adopting the array API standard)

doc/release/upcoming_changes/18585.new_feature.rst

@@ -0,0 +1,15 @@
+Implementation of the NEP 47 (adopting the array API standard)
+--------------------------------------------------------------
+
+An initial implementation of `NEP 47`_ (adoption the array API standard) has
+been added as ``numpy.array_api``. The implementation is experimental and will
+issue a UserWarning on import, as the `array API standard
+<https://data-apis.org/array-api/latest/index.html>`_ is still in draft state.
+``numpy.array_api`` is a conforming implementation of the array API standard,
+which is also minimal, meaning that only those functions and behaviors that
+are required by the standard are implemented (see the NEP for more info).
+Libraries wishing to make use of the array API standard are encouraged to use
+``numpy.array_api`` to check that they are only using functionality that is
+guaranteed to be present in standard conforming implementations.
+
+.. _`NEP 47`: https://numpy.org/neps/nep-0047-array-api-standard.html

numpy/_pytesttester.py

@@ -137,13 +137,20 @@ def __call__(self, label='fast', verbose=1, extra_argv=None,
         # offset verbosity. The "-q" cancels a "-v".
         pytest_args += ["-q"]
 
-        # Filter out distutils cpu warnings (could be localized to
-        # distutils tests). ASV has problems with top level import,
-        # so fetch module for suppression here.
         with warnings.catch_warnings():
             warnings.simplefilter("always")
+            # Filter out distutils cpu warnings (could be localized to
+            # distutils tests). ASV has problems with top level import,
+            # so fetch module for suppression here.
             from numpy.distutils import cpuinfo
 
+        with warnings.catch_warnings(record=True):
+            # Ignore the warning from importing the array_api submodule. This
+            # warning is done on import, so it would break pytest collection,
+            # but importing it early here prevents the warning from being
+            # issued when it imported again.
+            import numpy.array_api
+
         # Filter out annoying import messages. Want these in both develop and
         # release mode.
         pytest_args += [