Shelve or pickle module

[Guillaume Bog]

Hello,

I read and re-read "Python in a Nutshell" written by Alex Martelli,
who knows what he is talking about. I'm a bit new to python and I'm
going to start doing persistence side on a project. Martelli's book
seems to tell me that I should use shelve module, but any code I
browsed is using pickle instead. Is there any reason to prefer pickle
over shelve?

Thanks,