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| -rw-r--r-- | doc/source/release/1.20.0-notes.rst | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/doc/source/release/1.20.0-notes.rst b/doc/source/release/1.20.0-notes.rst index 73b470f3f..9f46a3e80 100644 --- a/doc/source/release/1.20.0-notes.rst +++ b/doc/source/release/1.20.0-notes.rst @@ -253,6 +253,18 @@ library. Compatibility notes =================== +``isinstance(dtype, np.dtype)`` and not ``type(dtype) is not np.dtype`` +----------------------------------------------------------------------- +NumPy dtypes are not direct instances of ``np.dtype`` anymore. Code that +may have used ``type(dtype) is np.dtype`` will always return ``False`` and +must be updated to use the correct version ``isinstance(dtype, np.dtype)``. + +This change also affects the C-side macro ``PyArray_DescrCheck`` if compiled +against a NumPy older than 1.16.6. If code uses this macro and wishes to +compile against an older version of NumPy, it must replace the macro +(see also `C API changes`_ section). + + Same kind casting in concatenate with ``axis=None`` --------------------------------------------------- When `~numpy.concatenate` is called with ``axis=None``, @@ -524,6 +536,23 @@ cannot represent ``b"1"`` faithfully. C API changes ============= +The ``PyArray_DescrCheck`` macro is modified +-------------------------------------------- +The ``PyArray_DescrCheck`` macro has been updated since NumPy 1.16.6 to be:: + + #define PyArray_DescrCheck(op) PyObject_TypeCheck(op, &PyArrayDescr_Type) + +Starting with NumPy 1.20 code that is compiled against an earlier version +will be API incompatible with NumPy 1.20. +The fix is to either compile against 1.16.6 (if the NumPy 1.16 release is +the oldest release you wish to support), or manually inline the macro by +replacing it with the new definition:: + + PyObject_TypeCheck(op, &PyArrayDescr_Type) + +which is compatible with all NumPy versions. + + Size of ``np.ndarray`` and ``np.void_`` changed ----------------------------------------------- The size of the ``PyArrayObject`` and ``PyVoidScalarObject`` |