Most languages that are whitespace sensitive don't actually allow you to mix indentation. In fact, Python 2 will give you an error saying that a particular lin

Most languages that are whitespace sensitive don't actually allow you to mix indentation. In fact, Python 2 will give you an error saying that a particular line doesn't match indentation level if it's a different number of spaces and 3 will give you a warning (and since warnings can be made into errors...).