Python sort of did too, you can use _ to access the last-returned variable in the interpreter.

    [testfunc(x) for x in testlist]

    <successful result>

    success = _

    print _

    <successful result>

It's useful when using the interpreter as a calculator, or when you're bashing out some calculation you can never remember how to do properly.

The same thing also works in irb.

    >> "foo"
    => "foo"
    >> bar = _
    => "foo"
    >> bar
    => "foo"

in bash you can use $_ to access the last argument of the previous command. It lets you do things like this:

    $ pwd
    /home/foo
    $ mkdir -p bar/baz/qux && cd $_
    $ pwd
    /home/foo/bar/baz/qux