The actual interpreter code is irrelevant. Switch would be a feature of the language being interpreted, not of the interpreter.
If the task is to match an expression X against a variety of values, then expressing that as a switch means the interpreter /could/ use a jump table (of labels within the byte code), rather than execute a chain of X==Y tests within byte code. So, evaluate X once then it could be a single byte code op. At least, it will know that exactly the same X value is being tested. So you evaluate it once then keep it on the stack. Think of Switch as another kind if hint. -- Bart -- https://mail.python.org/mailman/listinfo/python-list
