I agree. Join should word the same as split: >>> "abcbe".split("b") ['a', 'c', 'e'] So to get back the original string you should be able to say: ['

I agree. Join should word the same as split: >>> "abcbe".split("b") ['a', 'c', 'e'] So to get back the original string you should be able to say: ['a', 'c', 'e'].join("b") #!!! WRONG !!! but this doesn't work and instead you have to say: >>> "b".join(['a', 'c', 'e']) 'abcbe'