Mass-Renaming folders win32

[evaisse]

I've a folder structure like this :

"Folder A"
|--> "1"
|--> "2"
---> "3"

"Folder B"
|--> "4"
---> "5"


And I want to obtain a structure like this :

"Folder A - 1"
"Folder A - 2"
"Folder A - 3"
"Folder B - 4"
"Folder B - 5"

Can someone help me ? I am python beginner