Major update of all demo programs to use new PEP8 bindings, etc

DemoPrograms old/Demo_Compare_Files.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+# sg.SetOptions(button_color=sg.COLOR_SYSTEM_DEFAULT)
+
+def GetFilesToCompare():
+    form_rows = [[sg.Text('Enter 2 files to comare')],
+                 [sg.Text('File 1', size=(15, 1)), sg.InputText(key='file1'), sg.FileBrowse()],
+                 [sg.Text('File 2', size=(15, 1)), sg.InputText(key='file2'), sg.FileBrowse(target='file2')],
+                 [sg.Submit(), sg.Cancel()]]
+
+    window = sg.Window('File Compare')
+    event, values = window.Layout(form_rows).Read()
+    return event, values
+
+def main():
+    button, values = GetFilesToCompare()
+    f1 = values['file1']
+    f2 = values['file2']
+
+    if any((button != 'Submit', f1 =='', f2 == '')):
+        sg.PopupError('Operation cancelled')
+        sys.exit(69)
+
+    # --- This portion of the code is not GUI related ---
+    with open(f1, 'rb') as file1:
+        with open(f2, 'rb') as file2:
+            a = file1.read()
+            b = file2.read()
+
+        for i, x in enumerate(a):
+            if x != b[i]:
+                sg.Popup('Compare results for files', f1, f2, '**** Mismatch at offset {} ****'.format(i))
+                break
+        else:
+            if len(a) == len(b):
+                sg.Popup('**** The files are IDENTICAL ****')
+
+
+if __name__ == '__main__':
+    main()