bpo-38916: array.array: remove fromstring() and tostring() (GH-17487)

array.array: Remove tostring() and fromstring() methods.  They were
aliases to tobytes() and frombytes(), deprecated since Python 3.2.

Author: vstinner

Doc/library/array.rst

@@ -169,11 +169,6 @@ The following data items and methods are also supported:
    a.append(x)`` except that if there is a type error, the array is unchanged.
 
 
-.. method:: array.fromstring()
-
-   Deprecated alias for :meth:`frombytes`.
-
-
 .. method:: array.fromunicode(s)
 
    Extends this array with data from the given unicode string.  The array must
@@ -231,11 +226,6 @@ The following data items and methods are also supported:
    Convert the array to an ordinary list with the same items.
 
 
-.. method:: array.tostring()
-
-   Deprecated alias for :meth:`tobytes`.
-
-
 .. method:: array.tounicode()
 
    Convert the array to a unicode string.  The array must be a type ``'u'`` array;

Doc/whatsnew/3.9.rst

@@ -279,6 +279,11 @@ Deprecated
 Removed
 =======
 
+* :class:`array.array`: ``tostring()`` and ``fromstring()`` methods have been
+  removed. They were aliases to ``tobytes()`` and ``frombytes()``, deprecated
+  since Python 3.2.
+  (Contributed by Victor Stinner in :issue:`38916`.)
+
 * The abstract base classes in :mod:`collections.abc` no longer are
   exposed in the regular :mod:`collections` module.  This will help
   create a clearer distinction between the concrete classes and the abstract

Lib/test/test_array.py

@@ -426,26 +426,6 @@ def test_tofromlist(self):
         b.fromlist(a.tolist())
         self.assertEqual(a, b)
 
-    def test_tofromstring(self):
-        # Warnings not raised when arguments are incorrect as Argument Clinic
-        # handles that before the warning can be raised.
-        nb_warnings = 2
-        with warnings.catch_warnings(record=True) as r:
-            warnings.filterwarnings("always",
-                                    message=r"(to|from)string\(\) is deprecated",
-                                    category=DeprecationWarning)
-            a = array.array(self.typecode, 2*self.example)
-            b = array.array(self.typecode)
-            self.assertRaises(TypeError, a.tostring, 42)
-            self.assertRaises(TypeError, b.fromstring)
-            self.assertRaises(TypeError, b.fromstring, 42)
-            b.fromstring(a.tostring())
-            self.assertEqual(a, b)
-            if a.itemsize>1:
-                self.assertRaises(ValueError, b.fromstring, "x")
-                nb_warnings += 1
-        self.assertEqual(len(r), nb_warnings)
-
     def test_tofrombytes(self):
         a = array.array(self.typecode, 2*self.example)
         b = array.array(self.typecode)

Misc/NEWS.d/next/Library/2019-12-06-18-47-56.bpo-38916.K-raU8.rst

@@ -0,0 +1,3 @@
+:class:`array.array`: Remove ``tostring()`` and ``fromstring()`` methods.
+They were aliases to ``tobytes()`` and ``frombytes()``, deprecated since
+Python 3.2.

Modules/arraymodule.c

@@ -1623,27 +1623,6 @@ frombytes(arrayobject *self, Py_buffer *buffer)
     Py_RETURN_NONE;
 }
 
-/*[clinic input]
-array.array.fromstring
-
-    buffer: Py_buffer(accept={str, buffer})
-    /
-
-Appends items from the string, interpreting it as an array of machine values, as if it had been read from a file using the fromfile() method).
-
-This method is deprecated. Use frombytes instead.
-[clinic start generated code]*/
-
-static PyObject *
-array_array_fromstring_impl(arrayobject *self, Py_buffer *buffer)
-/*[clinic end generated code: output=31c4baa779df84ce input=a3341a512e11d773]*/
-{
-    if (PyErr_WarnEx(PyExc_DeprecationWarning,
-            "fromstring() is deprecated. Use frombytes() instead.", 2) != 0)
-        return NULL;
-    return frombytes(self, buffer);
-}
-
 /*[clinic input]
 array.array.frombytes
 
@@ -1678,24 +1657,6 @@ array_array_tobytes_impl(arrayobject *self)
     }
 }
 
-/*[clinic input]
-array.array.tostring
-
-Convert the array to an array of machine values and return the bytes representation.
-
-This method is deprecated. Use tobytes instead.
-[clinic start generated code]*/
-
-static PyObject *
-array_array_tostring_impl(arrayobject *self)
-/*[clinic end generated code: output=7d6bd92745a2c8f3 input=b6c0ddee7b30457e]*/
-{
-    if (PyErr_WarnEx(PyExc_DeprecationWarning,
-            "tostring() is deprecated. Use tobytes() instead.", 2) != 0)
-        return NULL;
-    return array_array_tobytes_impl(self);
-}
-
 /*[clinic input]
 array.array.fromunicode
 
@@ -2283,7 +2244,6 @@ static PyMethodDef array_methods[] = {
     ARRAY_ARRAY_EXTEND_METHODDEF
     ARRAY_ARRAY_FROMFILE_METHODDEF
     ARRAY_ARRAY_FROMLIST_METHODDEF
-    ARRAY_ARRAY_FROMSTRING_METHODDEF
     ARRAY_ARRAY_FROMBYTES_METHODDEF
     ARRAY_ARRAY_FROMUNICODE_METHODDEF
     ARRAY_ARRAY_INDEX_METHODDEF
@@ -2294,7 +2254,6 @@ static PyMethodDef array_methods[] = {
     ARRAY_ARRAY_REVERSE_METHODDEF
     ARRAY_ARRAY_TOFILE_METHODDEF
     ARRAY_ARRAY_TOLIST_METHODDEF
-    ARRAY_ARRAY_TOSTRING_METHODDEF
     ARRAY_ARRAY_TOBYTES_METHODDEF
     ARRAY_ARRAY_TOUNICODE_METHODDEF
     ARRAY_ARRAY___SIZEOF___METHODDEF