Fix function names in error messages of os.spawnve(), os.preadv() and wm_attributes()

os.spawnve() said "spawnv()" when the first element of argv is empty,
os.preadv() said "preadv2()" when buffers is not a sequence, and
tkinter's wm_attributes() said "wm_attribute()" when options are given
both positionally and as keywords.  Add tests checking the messages.

Author: thejesh23

Lib/test/test_os/test_os.py

@@ -3593,6 +3593,12 @@ def test_spawnve_noargs(self):
         self.assertRaises(ValueError, os.spawnve, os.P_NOWAIT, program, ('',), {})
         self.assertRaises(ValueError, os.spawnve, os.P_NOWAIT, program, [''], {})
 
+    @requires_native_spawnv
+    def test_spawnve_empty_first_arg_message(self):
+        with self.assertRaisesRegex(ValueError,
+                                    r'^spawnve\(\) arg 2 first element'):
+            os.spawnve(os.P_NOWAIT, sys.executable, [''], {})
+
     @requires_native_spawnv
     def test_spawnv_arg_conversion_errors(self):
         # A non-path argv item gets a TypeError naming the argument...

Lib/test/test_os/test_posix.py

@@ -328,6 +328,8 @@ def test_preadv(self):
             buf = [bytearray(i) for i in [5, 3, 2]]
             self.assertEqual(posix.preadv(fd, buf, 3), 10)
             self.assertEqual([b't1tt2', b't3t', b'5t'], list(buf))
+            with self.assertRaisesRegex(TypeError, r'^preadv\(\) arg 2 '):
+                posix.preadv(fd, 42, 0)
         finally:
             os.close(fd)
 

Lib/test/test_tkinter/test_misc.py

@@ -1160,6 +1160,8 @@ def test_wm_attribute(self):
         w.wm_attributes(alpha=1.0)
         self.assertEqual(w.wm_attributes('alpha'),
                          1.0 if self.wantobjects else '1.0')
+        with self.assertRaisesRegex(TypeError, r'^wm_attributes\(\) options'):
+            w.wm_attributes('alpha', alpha=0.5)
 
     def test_wm_iconbitmap(self):
         t = tkinter.Toplevel(self.root)

Lib/tkinter/__init__.py

@@ -2355,7 +2355,7 @@ def wm_attributes(self, *args, return_python_dict=False, **kwargs):
             # TODO: deprecate
             return self.tk.call('wm', 'attributes', self._w, *args)
         elif args:
-            raise TypeError('wm_attribute() options have been specified as '
+            raise TypeError('wm_attributes() options have been specified as '
                             'positional and keyword arguments')
         else:
             self.tk.call('wm', 'attributes', self._w, *self._options(kwargs))

Modules/posixmodule.c

@@ -8369,7 +8369,7 @@ os_spawnve_impl(PyObject *module, int mode, path_t *path, PyObject *argv,
             lastarg = i + 1;
             PyErr_SetString(
                 PyExc_ValueError,
-                "spawnv() arg 2 first element cannot be empty");
+                "spawnve() arg 2 first element cannot be empty");
             goto fail_1;
         }
     }
@@ -12454,7 +12454,7 @@ os_preadv_impl(PyObject *module, int fd, PyObject *buffers, Py_off_t offset,
 
     if (!PySequence_Check(buffers)) {
         PyErr_SetString(PyExc_TypeError,
-            "preadv2() arg 2 must be a sequence");
+            "preadv() arg 2 must be a sequence");
         return -1;
     }