copying files through Python

[Lalit]

I am new to python. Infact started yesterday and feeling out of place.
I need to write a program which would transfer files under one folder
structure (there are sub folders) to single folder. Can anyone give me
some idea like which library files or commands would be suitable for
this file transfer task. I am sure its matter of few commands. It
would be even more great if I could get some sample code with
instructions

Thanks