>>> haystack=["Zig","Zag","Wally","Ronald","Bush","Krusty","Charlie","Bush","Bozo"]
>>> haystack.index('Bush')
4
>>> haystack.index('Washington')
Traceback (most recent call last):
  File "<pyshell#95>", line 1, in <module>
    haystack.index('Washington')
ValueError: list.index(x): x not in list
>>>