bpo-15303: Support widgets with boolean value False in Tkinter (GH-23904)
Use `widget is None` instead of checking the boolean value of a widget.
diff --git a/Lib/tkinter/tix.py b/Lib/tkinter/tix.py
index ef1e740..7d24075 100644
--- a/Lib/tkinter/tix.py
+++ b/Lib/tkinter/tix.py
@@ -386,7 +386,7 @@ def config_all(self, option, value):
self.tk.call(name, 'configure', '-' + option, value)
# These are missing from Tkinter
def image_create(self, imgtype, cnf={}, master=None, **kw):
- if not master:
+ if master is None:
master = self
if kw and cnf: cnf = _cnfmerge((cnf, kw))
elif kw: cnf = kw
@@ -467,7 +467,7 @@ class DisplayStyle:
(multiple) Display Items"""
def __init__(self, itemtype, cnf={}, *, master=None, **kw):
- if not master:
+ if master is None:
if 'refwindow' in kw:
master = kw['refwindow']
elif 'refwindow' in cnf:
@@ -862,7 +862,7 @@ def add(self, entry, cnf={}, **kw):
return self.tk.call(self._w, 'add', entry, *self._options(cnf, kw))
def add_child(self, parent=None, cnf={}, **kw):
- if not parent:
+ if parent is None:
parent = ''
return self.tk.call(
self._w, 'addchild', parent, *self._options(cnf, kw))