diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 33b5ed0..23ebe54 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -187,7 +187,7 @@
         else:
             self._name = 'PY_VAR' + repr(_varnum)
             _varnum += 1
-        if value != None:
+        if value is not None:
             self.set(value)
         elif not self._tk.call("info", "exists", self._name):
             self.set(self._default)
diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 7cf298d..960a9f6 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -749,25 +749,25 @@
     global _width, _height, _startx, _starty
 
     width = geometry.get('width',_width)
-    if width is None or width >= 0:
+    if width >= 0 or width is None:
         _width = width
     else:
         raise ValueError("width can not be less than 0")
 
     height = geometry.get('height',_height)
-    if height is None or height >= 0:
+    if height >= 0 or height is None:
         _height = height
     else:
         raise ValueError("height can not be less than 0")
 
     startx = geometry.get('startx', _startx)
-    if startx is None or startx >= 0:
+    if startx >= 0 or startx is None:
         _startx = _startx
     else:
         raise ValueError("startx can not be less than 0")
 
     starty = geometry.get('starty', _starty)
-    if starty is None or starty >= 0:
+    if starty >= 0 or starty is None:
         _starty = starty
     else:
         raise ValueError("startx can not be less than 0")