MAINT: remove deprecated trapz function, disp method and `bias/dd…

…of` args in `corrcoef` This commit removes long-deprecated code paths in `numpy/lib/_function_base_impl`: - Removed `numpy.trapz`, deprecated in NumPy 2.0 (2023-08-18) - Removed `disp` method - Removed `bias` and `ddof` arguments from `numpy.corrcoef` Removed associated tests from `numpy/lib/tests/test_function_base.py` and `numpy/_core/test_deprecations.py` Associated tests and type stubs were also updated. All tests and Ruff checks pass locally.
numpy · mattip · Oct 17, 2025 · Oct 16, 2025 · Oct 17, 2025 · Oct 17, 2025
commit e4d64414394cbb2ae62e0f61c3230ba88f537090
diff --git a/numpy/__init__.py b/numpy/__init__.py
@@ -505,7 +505,6 @@
         sinc,
         sort_complex,
         trapezoid,
-        trapz,
         trim_zeros,
         unwrap,
         vectorize,

diff --git a/numpy/__init__.pyi b/numpy/__init__.pyi
@@ -460,7 +460,6 @@ from numpy.lib._function_base_impl import (  # type: ignore[deprecated]
     blackman,
     kaiser,
     trapezoid,
-    trapz,
     i0,
     meshgrid,
     delete,
@@ -686,7 +685,7 @@ __all__ = [  # noqa: RUF022
     "gradient", "angle", "unwrap", "sort_complex", "flip", "rot90", "extract", "place",
     "vectorize", "asarray_chkfinite", "average", "bincount", "digitize", "cov",
     "corrcoef", "median", "sinc", "hamming", "hanning", "bartlett", "blackman",
-    "kaiser", "trapezoid", "trapz", "i0", "meshgrid", "delete", "insert", "append",
+    "kaiser", "trapezoid", "i0", "meshgrid", "delete", "insert", "append",
     "interp", "quantile",
     # lib._twodim_base_impl.__all__
     "diag", "diagflat", "eye", "fliplr", "flipud", "tri", "triu", "tril", "vander",

diff --git a/numpy/_core/tests/test_deprecations.py b/numpy/_core/tests/test_deprecations.py
@@ -280,9 +280,8 @@ def test_deprecated_np_lib_math(self):
 class TestLibImports(_DeprecationTestCase):
     # Deprecated in Numpy 1.26.0, 2023-09
     def test_lib_functions_deprecation_call(self):
-        from numpy import row_stack, trapz
+        from numpy import row_stack
         from numpy._core.numerictypes import maximum_sctype
-        from numpy.lib._function_base_impl import disp
         from numpy.lib._npyio_impl import recfromcsv, recfromtxt
         from numpy.lib._shape_base_impl import get_array_wrap
         from numpy.lib._utils_impl import safe_eval
@@ -295,12 +294,10 @@ def test_lib_functions_deprecation_call(self):
         self.assert_deprecated(lambda: recfromcsv(data_gen()))
         self.assert_deprecated(lambda: recfromtxt(data_gen(), **kwargs))
 
-        self.assert_deprecated(lambda: disp("test"))
         self.assert_deprecated(get_array_wrap)
         self.assert_deprecated(lambda: maximum_sctype(int))
 
         self.assert_deprecated(lambda: row_stack([[]]))
-        self.assert_deprecated(lambda: trapz([1], [1]))
         self.assert_deprecated(lambda: np.chararray)
 
 

diff --git a/numpy/_expired_attrs_2_0.py b/numpy/_expired_attrs_2_0.py
@@ -61,7 +61,6 @@
         "or use `typing.deprecated`.",
     "deprecate_with_doc": "Emit `DeprecationWarning` with `warnings.warn` "
         "directly, or use `typing.deprecated`.",
-    "disp": "Use your own printing function instead.",
     "find_common_type":
         "Use `numpy.promote_types` or `numpy.result_type` instead. "
         "To achieve semantics for the `scalar_types` argument, use "

diff --git a/numpy/_expired_attrs_2_0.pyi b/numpy/_expired_attrs_2_0.pyi
@@ -47,7 +47,6 @@ class _ExpiredAttributesType(TypedDict):
     recfromtxt: str
     deprecate: str
     deprecate_with_doc: str
-    disp: str
     find_common_type: str
     round_: str
     get_array_wrap: str

diff --git a/numpy/lib/_function_base_impl.py b/numpy/lib/_function_base_impl.py
@@ -2,7 +2,6 @@
 import collections.abc
 import functools
 import re
-import sys
 import warnings
 
 import numpy as np
@@ -68,7 +67,7 @@
     'rot90', 'extract', 'place', 'vectorize', 'asarray_chkfinite', 'average',
     'bincount', 'digitize', 'cov', 'corrcoef',
     'median', 'sinc', 'hamming', 'hanning', 'bartlett',
-    'blackman', 'kaiser', 'trapezoid', 'trapz', 'i0',
+    'blackman', 'kaiser', 'trapezoid', 'i0',
     'meshgrid', 'delete', 'insert', 'append', 'interp',
     'quantile'
     ]
@@ -2119,62 +2118,6 @@ def place(arr, mask, vals):
     return _place(arr, mask, vals)
 
 
-def disp(mesg, device=None, linefeed=True):
-    """
-    Display a message on a device.
-
-    .. deprecated:: 2.0
-        Use your own printing function instead.
-
-    Parameters
-    ----------
-    mesg : str
-        Message to display.
-    device : object
-        Device to write message. If None, defaults to ``sys.stdout`` which is
-        very similar to ``print``. `device` needs to have ``write()`` and
-        ``flush()`` methods.
-    linefeed : bool, optional
-        Option whether to print a line feed or not. Defaults to True.
-
-    Raises
-    ------
-    AttributeError
-        If `device` does not have a ``write()`` or ``flush()`` method.
-
-    Examples
-    --------
-    >>> import numpy as np
-
-    Besides ``sys.stdout``, a file-like object can also be used as it has
-    both required methods:
-
-    >>> from io import StringIO
-    >>> buf = StringIO()
-    >>> np.disp('"Display" in a file', device=buf)
-    >>> buf.getvalue()
-    '"Display" in a file\\n'
-
-    """
-
-    # Deprecated in NumPy 2.0, 2023-07-11
-    warnings.warn(
-        "`disp` is deprecated, "
-        "use your own printing function instead. "
-        "(deprecated in NumPy 2.0)",
-        DeprecationWarning,
-        stacklevel=2
-    )
-
-    if device is None:
-        device = sys.stdout
-    if linefeed:
-        device.write(f'{mesg}\n')
-    else:
-        device.write(f'{mesg}')
-    device.flush()
-
-
 # See https://docs.scipy.org/doc/numpy/reference/c-api.generalized-ufuncs.html
 _DIMENSION_NAME = r'\w+'
 _CORE_DIMENSION_LIST = f'(?:{_DIMENSION_NAME}(?:,{_DIMENSION_NAME})*)?'
@@ -2959,14 +2902,7 @@ def corrcoef(x, y=None, rowvar=True, bias=np._NoValue, ddof=np._NoValue, *,
         variable, with observations in the columns. Otherwise, the relationship
         is transposed: each column represents a variable, while the rows
         contain observations.
-    bias : _NoValue, optional
-        Has no effect, do not use.
-
-        .. deprecated:: 1.10.0
-    ddof : _NoValue, optional
-        Has no effect, do not use.
 
-        .. deprecated:: 1.10.0
     dtype : data-type, optional
         Data-type of the result. By default, the return data-type will have
         at least `numpy.float64` precision.
@@ -3061,10 +2997,6 @@ def corrcoef(x, y=None, rowvar=True, bias=np._NoValue, ddof=np._NoValue, *,
              1.        ]])
 
     """
-    if bias is not np._NoValue or ddof is not np._NoValue:
-        # 2015-03-15, 1.10
-        warnings.warn('bias and ddof have no effect and are deprecated',
-                      DeprecationWarning, stacklevel=2)
     c = cov(x, y, rowvar, dtype=dtype)
     try:
         d = diag(c)
@@ -5080,24 +5012,6 @@ def trapezoid(y, x=None, dx=1.0, axis=-1):
     return ret
 
 
-@set_module('numpy')
-def trapz(y, x=None, dx=1.0, axis=-1):
-    """
-    `trapz` is deprecated in NumPy 2.0.
-
-    Please use `trapezoid` instead, or one of the numerical integration
-    functions in `scipy.integrate`.
-    """
-    # Deprecated in NumPy 2.0, 2023-08-18
-    warnings.warn(
-        "`trapz` is deprecated. Use `trapezoid` instead, or one of the "
-        "numerical integration functions in `scipy.integrate`.",
-        DeprecationWarning,
-        stacklevel=2
-    )
-    return trapezoid(y, x=x, dx=dx, axis=axis)
-
-
 def _meshgrid_dispatcher(*xi, copy=None, sparse=None, indexing=None):
     return xi
 

diff --git a/numpy/lib/_function_base_impl.pyi b/numpy/lib/_function_base_impl.pyi
@@ -14,7 +14,7 @@ from typing import (
     overload,
     type_check_only,
 )
-from typing_extensions import TypeIs, deprecated
+from typing_extensions import TypeIs
 
 import numpy as np
 from numpy import (
@@ -87,7 +87,6 @@ __all__ = [
     "blackman",
     "kaiser",
     "trapezoid",
-    "trapz",
     "i0",
     "meshgrid",
     "delete",
@@ -990,10 +989,6 @@ def trapezoid(
     floating | complexfloating | timedelta64
     | NDArray[floating | complexfloating | timedelta64 | object_]
 ): ...
-
-@deprecated("Use 'trapezoid' instead")
-def trapz(y: ArrayLike, x: ArrayLike | None = None, dx: float = 1.0, axis: int = -1) -> generic | NDArray[generic]: ...
-
 @overload
 def meshgrid(
     *,

diff --git a/numpy/lib/tests/test_function_base.py b/numpy/lib/tests/test_function_base.py
@@ -565,10 +565,6 @@ def test_return_dtype(self):
         m = np.isnan(d)
         assert_equal(select([m], [d]), [0, 0, 0, np.nan, 0, 0])
 
-    def test_deprecated_empty(self):
-        assert_raises(ValueError, select, [], [], 3j)
-        assert_raises(ValueError, select, [], [])
-
     def test_non_bool_deprecation(self):
         choices = self.choices
         conditions = self.conditions[:]
@@ -2476,28 +2472,6 @@ def test_simple(self):
         assert_almost_equal(tgt2, self.res2)
         assert_(np.all(np.abs(tgt2) <= 1.0))
 
-    def test_ddof(self):
-        # ddof raises DeprecationWarning
-        with warnings.catch_warnings():
-            warnings.simplefilter("always")
-            pytest.warns(DeprecationWarning, corrcoef, self.A, ddof=-1)
-            warnings.simplefilter('ignore', DeprecationWarning)
-            # ddof has no or negligible effect on the function
-            assert_almost_equal(corrcoef(self.A, ddof=-1), self.res1)
-            assert_almost_equal(corrcoef(self.A, self.B, ddof=-1), self.res2)
-            assert_almost_equal(corrcoef(self.A, ddof=3), self.res1)
-            assert_almost_equal(corrcoef(self.A, self.B, ddof=3), self.res2)
-
-    def test_bias(self):
-        # bias raises DeprecationWarning
-        with warnings.catch_warnings():
-            warnings.simplefilter("always")
-            pytest.warns(DeprecationWarning, corrcoef, self.A, self.B, 1, 0)
-            pytest.warns(DeprecationWarning, corrcoef, self.A, bias=0)
-            warnings.simplefilter('ignore', DeprecationWarning)
-            # bias has no or negligible effect on the function
-            assert_almost_equal(corrcoef(self.A, bias=1), self.res1)
-
     def test_complex(self):
         x = np.array([[1, 2, 3], [1j, 2j, 3j]])
         res = corrcoef(x)

diff --git a/numpy/matlib.pyi b/numpy/matlib.pyi
@@ -450,7 +450,6 @@ from numpy import (  # noqa: F401
     trace,
     transpose,
     trapezoid,
-    trapz,
     tri,
     tril,
     tril_indices,
-Original file line number
+Diff line change
@@ Expand Up / @@ -450,7 +450,6 @@ from numpy import ( # noqa: F401 @@
         trace,
         transpose,
         trapezoid,
-        trapz,
         tri,
         tril,
         tril_indices,
@@ Expand Down @@