Quickly add GUI to script Recipe

Demo_Script_Parameters.py

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+import PySimpleGUI as sg
+import sys
+
+'''
+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:
+    button, (fname,) = sg.FlexForm('My Script').LayoutAndRead([[sg.T('Document to open')],
+                                                           [sg.In(), sg.FileBrowse()],
+                                                           [sg.Open(), sg.Cancel()]])
+else:
+    fname = sys.argv[1]
+
+if not fname:
+    sg.MsgBox("Cancel", "No filename supplied")
+    raise SystemExit("Cancelling: no filename supplied")