4 files changed, 0 insertions, 89 deletions
diff --git a/numpy/__init__.py b/numpy/__init__.py
index e41f7eae6..1880ceace 100644
--- a/numpy/__init__.py
+++ b/numpy/__init__.py
@@ -74,10 +74,6 @@ test
     Run numpy unittests
 show_config
     Show numpy build configuration
-dual
-    Overwrite certain functions with high-performance SciPy tools.
-    Note: `numpy.dual` is deprecated.  Use the functions from NumPy or Scipy
-    directly instead of importing them from `numpy.dual`.
 matlib
     Make everything matrices.
 __version__
diff --git a/numpy/dual.py b/numpy/dual.py
deleted file mode 100644
index eb7e61aac..000000000
--- a/numpy/dual.py
+++ /dev/null
@@ -1,83 +0,0 @@
-"""
-.. deprecated:: 1.20
-
-*This module is deprecated.  Instead of importing functions from*
-``numpy.dual``, *the functions should be imported directly from NumPy
-or SciPy*.
-
-Aliases for functions which may be accelerated by SciPy.
-
-SciPy_ can be built to use accelerated or otherwise improved libraries
-for FFTs, linear algebra, and special functions. This module allows
-developers to transparently support these accelerated functions when
-SciPy is available but still support users who have only installed
-NumPy.
-
-.. _SciPy : https://www.scipy.org
-
-"""
-import warnings
-
-
-warnings.warn('The module numpy.dual is deprecated.  Instead of using dual, '
-              'use the functions directly from numpy or scipy.',
-              category=DeprecationWarning,
-              stacklevel=2)
-
-# This module should be used for functions both in numpy and scipy if
-#  you want to use the numpy version if available but the scipy version
-#  otherwise.
-#  Usage  --- from numpy.dual import fft, inv
-
-__all__ = ['fft', 'ifft', 'fftn', 'ifftn', 'fft2', 'ifft2',
-           'norm', 'inv', 'svd', 'solve', 'det', 'eig', 'eigvals',
-           'eigh', 'eigvalsh', 'lstsq', 'pinv', 'cholesky', 'i0']
-
-import numpy.linalg as linpkg
-import numpy.fft as fftpkg
-from numpy.lib import i0
-import sys
-
-
-fft = fftpkg.fft
-ifft = fftpkg.ifft
-fftn = fftpkg.fftn
-ifftn = fftpkg.ifftn
-fft2 = fftpkg.fft2
-ifft2 = fftpkg.ifft2
-
-norm = linpkg.norm
-inv = linpkg.inv
-svd = linpkg.svd
-solve = linpkg.solve
-det = linpkg.det
-eig = linpkg.eig
-eigvals = linpkg.eigvals
-eigh = linpkg.eigh
-eigvalsh = linpkg.eigvalsh
-lstsq = linpkg.lstsq
-pinv = linpkg.pinv
-cholesky = linpkg.cholesky
-
-_restore_dict = {}
-
-def register_func(name, func):
-    if name not in __all__:
-        raise ValueError("{} not a dual function.".format(name))
-    f = sys._getframe(0).f_globals
-    _restore_dict[name] = f[name]
-    f[name] = func
-
-def restore_func(name):
-    if name not in __all__:
-        raise ValueError("{} not a dual function.".format(name))
-    try:
-        val = _restore_dict[name]
-    except KeyError:
-        return
-    else:
-        sys._getframe(0).f_globals[name] = val
-
-def restore_all():
-    for name in _restore_dict.keys():
-        restore_func(name)
diff --git a/numpy/meson.build b/numpy/meson.build
index b366b7b05..cc5a79bb2 100644
--- a/numpy/meson.build
+++ b/numpy/meson.build
@@ -103,7 +103,6 @@ python_sources = [
   'conftest.py',
   'ctypeslib.py',
   'ctypeslib.pyi',
-  'dual.py',
   'exceptions.py',
   'exceptions.pyi',
   'matlib.py',
diff --git a/numpy/tests/test_public_api.py b/numpy/tests/test_public_api.py
index 108ba0b74..e0681426e 100644
--- a/numpy/tests/test_public_api.py
+++ b/numpy/tests/test_public_api.py
@@ -248,7 +248,6 @@ PRIVATE_BUT_PRESENT_MODULES = ['numpy.' + s for s in [
     "distutils.numpy_distribution",
     "distutils.pathccompiler",
     "distutils.unixccompiler",
-    "dual",
     "f2py.auxfuncs",
     "f2py.capi_maps",
     "f2py.cb_rules",