GUI wxPython and SQL database

[Laurent François]

Hello

I'm trying to code a GUI to interface with a SQL database like postgresql
And I'm looking for some tutorial or resources.
Specialy I'm looking for good practice for coding how to fetch data from
widgets and update database.
Psycopg2 is OK for me (well a little...). My problem is the code that 
"connect" wxPython to psycopg2

Thanks for your help