output failure

 pyjunk  ~/s/a/pyjunk   master ±  python append.py
.F
======================================================================
FAIL: test_append_to_two (__main__.TestAppendTo)
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Traceback (most recent call last):
  File "append.py", line 25, in test_append_to_two
    self.assertListEqual(r, ['b', 'c'])
AssertionError: Lists differ: ['a', 'b', 'c'] != ['b', 'c']

First differing element 0:
'a'
'b'

First list contains 1 additional elements.
First extra element 2:
'c'

- ['a', 'b', 'c']
?  -----

+ ['b', 'c']

----------------------------------------------------------------------
Ran 2 tests in 0.001s

FAILED (failures=1)