Merge pull request numpy#24144 from ev-br/rm_np_cast

API: Remove several niche objects for numpy 2.0 python API cleanup

Author: seberg

doc/release/upcoming_changes/24144.python_removal.rst

@@ -0,0 +1,7 @@
+* ``np.cast`` has been removed. The literal replacement for
+  ``np.cast[dtype](arg)`` is ``np.asarray(arg, dtype=dtype)``.
+
+* ``np.source`` has been removed. The preferred replacement is 
+  ``inspect.getsource``.
+
+* ``np.lookfor`` has been removed.

numpy/core/numerictypes.py

@@ -90,7 +90,7 @@
 
 # we add more at the bottom
 __all__ = ['sctypeDict', 'sctypes',
-           'ScalarType', 'obj2sctype', 'cast', 'nbytes', 'sctype2char',
+           'ScalarType', 'obj2sctype', 'nbytes', 'sctype2char',
            'maximum_sctype', 'issctype', 'typecodes', 'find_common_type',
            'issubdtype', 'datetime_data', 'datetime_as_string',
            'busday_offset', 'busday_count', 'is_busday', 'busdaycalendar',
@@ -434,14 +434,12 @@ def __getitem__(self, obj):
         return dict.__getitem__(self, obj2sctype(obj))
 
 nbytes = _typedict()
-_alignment = _typedict()
 _maxvals = _typedict()
 _minvals = _typedict()
 def _construct_lookups():
     for name, info in _concrete_typeinfo.items():
         obj = info.type
         nbytes[obj] = info.bits // 8
-        _alignment[obj] = info.alignment
         if len(info) > 5:
             _maxvals[obj] = info.max
             _minvals[obj] = info.min
@@ -503,12 +501,6 @@ def sctype2char(sctype):
         raise KeyError(sctype)
     return dtype(sctype).char
 
-# Create dictionary of casting functions that wrap sequences
-# indexed by type or type character
-cast = _typedict()
-for key in _concrete_types:
-    cast[key] = lambda x, k=key: array(x, copy=False).astype(k)
-
 
 def _scalar_type_key(typ):
     """A ``key`` function for `sorted`."""

numpy/lib/tests/test_utils.py

@@ -11,19 +11,6 @@
 from io import StringIO
 
 
-@pytest.mark.skipif(sys.flags.optimize == 2, reason="Python running -OO")
-@pytest.mark.skipif(
-    sys.version_info == (3, 10, 0, "candidate", 1),
-    reason="Broken as of bpo-44524",
-)
-def test_lookfor():
-    out = StringIO()
-    utils.lookfor('eigenvalue', module='numpy', output=out,
-                  import_modules=False)
-    out = out.getvalue()
-    assert_('numpy.linalg.eig' in out)
-
-
 @deprecate
 def old_func(self, x):
     return x