How to unset variable

Is there a way to un-set a variable in Psithon?
I’d like to clear the contents of the “active” keyword…

psi4.core.set_global_option("ACTIVE", "")
psi4.core.revoke_global_option_changed("ACTIVE")

should do the trick. More generically, psi4.clean_options() will reset every option to default state.