[John J. Lee] > The Python 2.1.1 manual, section 2.1.6, says: > > k in a 1 if a has a key k, else 0 > k not in a 0 if a has a key k, else 1 These are new-in-2.2 features. They got documented "early" by mistake. The 2.1.2 docs will repair this. Use a.has_key() before 2.2.