Selecting site in admin

As a newbye I'm happily using admin.

Now I would like to select what a user can see in the admin main page according to its username just as a (non-working) example I would like to follow this idea

in admin.py

if request.user=='victor':
admin.site.register(Categorie)
admin.site.register(Codiciiva)
admin.site.register(Magazzini)
else:
admin.site.register(Marca)
admin.site.register(Fornitori,FornitoriOption)
admin.site.register(Pazienti,PazientiOption)
admin.site.register(unita_misura)

How can I do this?

Ciao
Vittorio

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