Debugging-Python-applications-in-flatpaks.md

@@ -10,11 +10,37 @@ Assuming that you have a flatpak installed called `com.example.first_application
 flatpak run --devel --command=bash com.example.first_application
 ```
 
-This starts a `bash` shell in the sandbox.
+This starts a `bash` shell in the sandbox. You should see something like the following in the terminal:
+
+``` bash
+bash-4.4$
+```
+
+It is now possible to start debugging the application.
 
 ## Starting the Debugger
 
-For low level code debuggers, like GDB, we can usually just run the debugger, set breakpoints and run the application.
+For low level code debuggers, like GDB, we can usually just run the debugger, set breakpoints and run the application. For Python applications, it could be useful to use `pdb` instead. For an application script called `your-first-application` in the `/app/bin` directory, you can start debugging by running the `pdb` module as an option to the `python3` interpreter, passing the script as an argument:
+
+``` bash
+bash-4.4$ python3 -m pdb /app/bin/your-first-application 
+> /app/bin/your-first-application(8)<module>()
+-> import sys
+(Pdb) l
+  3  
+  4     # Copyright (C) 2018 Purism SPC
+  5     # SPDX-License-Identifier: GPL-3.0+
+  6     # Author: David Boddie <david.boddie@puri.sm>
+  7  
+  8  -> import sys
+  9     import gi
+ 10     gi.require_version('Gtk', '3.0')
+ 11     from gi.repository import GLib, Gtk
+ 12  
+ 13  
+```
+
+You can then use the usual commands to debug the application.
 
 ## References