bpo-33096: Fix ttk.Treeview.insert. (GH-6228)

Allow ttk.Treeview.insert to insert iid that has a false boolean value.
Note iid=0 and iid=False would be same.

Lib/tkinter/test/test_ttk/test_widgets.py

@@ -1662,6 +1662,15 @@ class TreeviewTest(AbstractWidgetTest, unittest.TestCase):
             self.tv.insert('', 'end', text=value), text=None),
             value)
 
+        # test for values which are not None
+        itemid = self.tv.insert('', 'end', 0)
+        self.assertEqual(itemid, '0')
+        itemid = self.tv.insert('', 'end', 0.0)
+        self.assertEqual(itemid, '0.0')
+        # this is because False resolves to 0 and element with 0 iid is already present
+        self.assertRaises(tkinter.TclError, self.tv.insert, '', 'end', False)
+        self.assertRaises(tkinter.TclError, self.tv.insert, '', 'end', '')
+
 
     def test_selection(self):
         self.assertRaises(TypeError, self.tv.selection, 'spam')

Lib/tkinter/ttk.py

@@ -1361,7 +1361,7 @@ class Treeview(Widget, tkinter.XView, tkinter.YView):
         already exist in the tree. Otherwise, a new unique identifier
         is generated."""
         opts = _format_optdict(kw)
-        if iid:
+        if iid is not None:
             res = self.tk.call(self._w, "insert", parent, index,
                 "-id", iid, *opts)
         else:

Misc/NEWS.d/next/Library/2018-03-25-13-18-16.bpo-33096.ofdbe7.rst

@@ -0,0 +1,4 @@
+Allow ttk.Treeview.insert to insert iid that has a false boolean value.
+Note iid=0 and iid=False would be same.
+Patch by Garvit Khatri.
+