Added a repl.it link to the top.

DemoPrograms/Demo_Chat.py

@@ -7,6 +7,12 @@ else:
 
 '''
 A chat window.  Add call to your send-routine, print the response and you're done
+
+To see this program RUN on the web go here:
+https://repl.it/@PySimpleGUI/Chat-Application-Demo
+
+Note that the size of the display on repl.it is smaller than most, so the sizes of the 
+Multiline and Output text areas were reduced in the online version.  Nothing else was changed
 '''
 
 sg.ChangeLookAndFeel('GreenTan')            # give our window a spiffy set of colors
@@ -17,16 +23,19 @@ layout =  [[sg.Text('Your output will go here', size=(40, 1))],
             sg.ReadButton('SEND', button_color=(sg.YELLOWS[0], sg.BLUES[0]), bind_return_key=True),
             sg.Button('EXIT', button_color=(sg.YELLOWS[0], sg.GREENS[0]))]]
 
-window = sg.Window('Chat window', default_element_size=(30, 2), font=('Helvetica',' 13'), default_button_element_size=(8,2)).Layout(layout)
+window = sg.Window('Chat window',
+                   default_element_size=(30, 2),
+                   font=('Helvetica',' 13'),
+                   default_button_element_size=(8,2)).Layout(layout)
 
 # ---===--- Loop taking in user input and using it  --- #
 while True:
-    (event, value) = window.Read()
+    (event, value) = window.Read(timeout=0)
     if event is 'SEND':
         query = value['query'].rstrip()
         # EXECUTE YOUR COMMAND HERE
         print('The command you entered was {}'.format(query))
-    elif event is None or event == 'EXIT':            # quit if exit button or X
+    elif event in (None, 'EXIT'):            # quit if exit button or X
         break
 sys.exit(69)