A simple Python cmd.Cmd shell supporting addition

addshell.py

import cmd
import shlex

class AddShell(cmd.Cmd):
    """ A simple cmd shell that adds numbers at the prompt """

    prompt = "Add> "
    def default(self, arg):
        items = shlex.split(arg)
        nums = [float(i) for i in items]
        print(sum(nums))

    def do_EOF(self, line):
        return True