Moved all demo programs into subfolder

DemoPrograms/Demo_Keypad.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+# Demonstrates a number of PySimpleGUI features including:
+#   Default element size
+#   auto_size_buttons
+#   Button
+#   Dictionary return values
+#   Update of elements in form (Text, Input)
+#   do_not_clear of Input elements
+
+
+
+layout = [[sg.Text('Enter Your Passcode')],
+          [sg.Input(size=(10, 1), do_not_clear=True, key='input')],
+          [sg.Button('1'), sg.Button('2'), sg.Button('3')],
+          [sg.Button('4'), sg.Button('5'), sg.Button('6')],
+          [sg.Button('7'), sg.Button('8'), sg.Button('9')],
+          [sg.Button('Submit'), sg.Button('0'), sg.Button('Clear')],
+          [sg.Text('', size=(15, 1), font=('Helvetica', 18), text_color='red', key='out')],
+          ]
+
+window = sg.Window('Keypad', default_button_element_size=(5, 2), auto_size_buttons=False, grab_anywhere=False).Layout(layout)
+
+# Loop forever reading the form's values, updating the Input field
+keys_entered = ''
+while True:
+    event, values = window.Read()  # read the form
+    if event is None:  # if the X button clicked, just exit
+        break
+    if event == 'Clear':  # clear keys if clear button
+        keys_entered = ''
+    elif event in '1234567890':
+        keys_entered = values['input']  # get what's been entered so far
+        keys_entered += event  # add the new digit
+    elif event == 'Submit':
+        keys_entered = values['input']
+        window.FindElement('out').Update(keys_entered)  # output the final string
+
+    window.FindElement('input').Update(keys_entered)  # change the form to reflect current key string