Episode 10: Digging into Ruby with Richard Schneems by Import This published on 2017-02-15T02:53:46Z Comment by Sergio Pulgarin Assuming that if follow the same syntax as this: >>> a += 3 -> a = a + 3. No surprise it raises this exception. 2017-04-26T14:08:03Z Comment by Import This @fable-7: a = None above it 2017-02-16T19:38:43Z Comment by Fable :) 2017-02-16T14:12:55Z Comment by Fable What am I missing here?! I must know this obscure syntax!! 2017-02-16T14:12:48Z Comment by Fable >>> a |= 3 Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'a' is not defined 2017-02-16T14:12:01Z