Changed bad if statements that were using 'is' and made '==' instead.

DemoPrograms/Demo_Matplotlib_Browser_Paned.py

@@ -2,13 +2,14 @@
 import sys
 if sys.version_info[0] >= 3:
     import PySimpleGUI as sg
+    import tkinter as Tk
 else:
     import PySimpleGUI27 as sg
+    import Tkinter as Tk
 import matplotlib
 matplotlib.use('TkAgg')
 from matplotlib.backends.backend_tkagg import FigureCanvasAgg
 import matplotlib.backends.tkagg as tkagg
-import tkinter as Tk
 import inspect
 
 """
@@ -892,7 +893,7 @@ while True:
     event, values = window.Read()
     # print(event)
     # show it all again and get buttons
-    if event is None or event is 'Exit':
+    if event in (None, 'Exit'):
         break
 
     try: