Issue #15133: _tkinter.tkapp.getboolean() now supports Tcl_Obj and always

returns bool.  tkinter.BooleanVar now validates input values (accepted bool,
int, str, and Tcl_Obj).  tkinter.BooleanVar.get() now always returns bool.

Lib/test/test_tcl.py

@@ -179,7 +179,8 @@ class TclTest(unittest.TestCase):
         tcl = self.interp.tk
         self.assertIs(tcl.getboolean('on'), True)
         self.assertIs(tcl.getboolean('1'), True)
-        self.assertEqual(tcl.getboolean(42), 42)
+        self.assertIs(tcl.getboolean(42), True)
+        self.assertIs(tcl.getboolean(0), False)
         self.assertRaises(TypeError, tcl.getboolean)
         self.assertRaises(TypeError, tcl.getboolean, 'on', '1')
         self.assertRaises(TypeError, tcl.getboolean, b'on')

Lib/tkinter/__init__.py

@@ -391,6 +391,11 @@ class BooleanVar(Variable):
         """
         Variable.__init__(self, master, value, name)
 
+    def set(self, value):
+        """Set the variable to VALUE."""
+        return self._tk.globalsetvar(self._name, self._tk.getboolean(value))
+    initialize = set
+
     def get(self):
         """Return the value of the variable as a bool."""
         try:

Lib/tkinter/test/test_tkinter/test_variables.py

 import unittest
 
-from tkinter import Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tcl
+from tkinter import (Variable, StringVar, IntVar, DoubleVar, BooleanVar, Tcl,
+                     TclError)
 
 
 class Var(Variable):
@@ -159,16 +160,41 @@ class TestBooleanVar(TestBase):
 
     def test_default(self):
         v = BooleanVar(self.root)
-        self.assertEqual(False, v.get())
+        self.assertIs(v.get(), False)
 
     def test_get(self):
         v = BooleanVar(self.root, True, "name")
-        self.assertAlmostEqual(True, v.get())
+        self.assertIs(v.get(), True)
         self.root.globalsetvar("name", "0")
-        self.assertAlmostEqual(False, v.get())
+        self.assertIs(v.get(), False)
+        self.root.globalsetvar("name", 42 if self.root.wantobjects() else 1)
+        self.assertIs(v.get(), True)
+        self.root.globalsetvar("name", 0)
+        self.assertIs(v.get(), False)
+        self.root.globalsetvar("name", "on")
+        self.assertIs(v.get(), True)
+
+    def test_set(self):
+        true = 1 if self.root.wantobjects() else "1"
+        false = 0 if self.root.wantobjects() else "0"
+        v = BooleanVar(self.root, name="name")
+        v.set(True)
+        self.assertEqual(self.root.globalgetvar("name"), true)
+        v.set("0")
+        self.assertEqual(self.root.globalgetvar("name"), false)
+        v.set(42)
+        self.assertEqual(self.root.globalgetvar("name"), true)
+        v.set(0)
+        self.assertEqual(self.root.globalgetvar("name"), false)
+        v.set("on")
+        self.assertEqual(self.root.globalgetvar("name"), true)
 
     def test_invalid_value_domain(self):
+        false = 0 if self.root.wantobjects() else "0"
         v = BooleanVar(self.root, name="name")
+        with self.assertRaises(TclError):
+            v.set("value")
+        self.assertEqual(self.root.globalgetvar("name"), false)
         self.root.globalsetvar("name", "value")
         with self.assertRaises(ValueError):
             v.get()

Lib/tkinter/ttk.py

@@ -573,7 +573,7 @@ class Widget(tkinter.Widget):
         if ret and callback:
             return callback(*args, **kw)
 
-        return bool(ret)
+        return ret
 
 
     def state(self, statespec=None):
@@ -681,7 +681,7 @@ class Entry(Widget, tkinter.Entry):
         """Force revalidation, independent of the conditions specified
         by the validate option. Returns False if validation fails, True
         if it succeeds. Sets or clears the invalid state accordingly."""
-        return bool(self.tk.getboolean(self.tk.call(self._w, "validate")))
+        return self.tk.getboolean(self.tk.call(self._w, "validate"))
 
 
 class Combobox(Entry):
@@ -1231,7 +1231,7 @@ class Treeview(Widget, tkinter.XView, tkinter.YView):
     def exists(self, item):
         """Returns True if the specified item is present in the tree,
         False otherwise."""
-        return bool(self.tk.getboolean(self.tk.call(self._w, "exists", item)))
+        return self.tk.getboolean(self.tk.call(self._w, "exists", item))
 
 
     def focus(self, item=None):

Misc/NEWS

@@ -19,6 +19,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #15133: _tkinter.tkapp.getboolean() now supports Tcl_Obj and always
+  returns bool.  tkinter.BooleanVar now validates input values (accepted bool,
+  int, str, and Tcl_Obj).  tkinter.BooleanVar.get() now always returns bool.
+
 - Issue #10590: xml.sax.parseString() now supports string argument.
 
 - Issue #23338: Fixed formatting ctypes error messages on Cygwin.

Modules/_tkinter.c

@@ -1934,19 +1934,24 @@ Tkapp_GetDouble(PyObject *self, PyObject *args)
 }
 
 static PyObject *
-Tkapp_GetBoolean(PyObject *self, PyObject *args)
+Tkapp_GetBoolean(PyObject *self, PyObject *arg)
 {
     char *s;
     int v;
 
-    if (PyTuple_Size(args) == 1) {
-        PyObject *o = PyTuple_GetItem(args, 0);
-        if (PyLong_Check(o)) {
-            Py_INCREF(o);
-            return o;
-        }
+    if (PyLong_Check(arg)) { /* int or bool */
+        return PyBool_FromLong(Py_SIZE(arg) != 0);
     }
-    if (!PyArg_ParseTuple(args, "s:getboolean", &s))
+
+    if (PyTclObject_Check(arg)) {
+        if (Tcl_GetBooleanFromObj(Tkapp_Interp(self),
+                                  ((PyTclObject*)arg)->value,
+                                  &v) == TCL_ERROR)
+            return Tkinter_Error(self);
+        return PyBool_FromLong(v);
+    }
+
+    if (!PyArg_Parse(arg, "s:getboolean", &s))
         return NULL;
     CHECK_STRING_LENGTH(s);
     if (Tcl_GetBoolean(Tkapp_Interp(self), s, &v) == TCL_ERROR)
@@ -2862,7 +2867,7 @@ static PyMethodDef Tkapp_methods[] =
     {"globalunsetvar",     Tkapp_GlobalUnsetVar, METH_VARARGS},
     {"getint",                 Tkapp_GetInt, METH_VARARGS},
     {"getdouble",              Tkapp_GetDouble, METH_VARARGS},
-    {"getboolean",             Tkapp_GetBoolean, METH_VARARGS},
+    {"getboolean",             Tkapp_GetBoolean, METH_O},
     {"exprstring",             Tkapp_ExprString, METH_VARARGS},
     {"exprlong",               Tkapp_ExprLong, METH_VARARGS},
     {"exprdouble",             Tkapp_ExprDouble, METH_VARARGS},