Moved all demo programs into subfolder

DemoPrograms/Demo_Script_Parameters.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+import sys
+if sys.version_info[0] >= 3:
+    import PySimpleGUI as sg
+else:
+    import PySimpleGUI27 as sg
+
+
+'''
+Quickly add a GUI to your script!
+
+This simple script shows a 1-line-GUI addition to a typical Python command line script.
+
+Previously this script accepted 1 parameter on the command line.  When executed, that
+parameter is read into the variable fname.
+
+The 1-line-GUI shows a form that allows the user to browse to find the filename. The GUI
+stores the result in the variable fname, just like the command line parsing did.
+'''
+
+if len(sys.argv) == 1:
+    event, (fname,) = sg.Window('My Script').Layout([[sg.T('Document to open')],
+                                                            [sg.In(), sg.FileBrowse()],
+                                                            [sg.CloseButton('Open'), sg.CloseButton('Cancel')]]).Read()
+else:
+    fname = sys.argv[1]
+
+if not fname:
+    sg.Popup("Cancel", "No filename supplied")
+    raise SystemExit("Cancelling: no filename supplied")