is this a bug?

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Python 2.0 (#1, Feb  7 2001, 22:41:16)
[GCC 2.95.2 19991024 (release)] on sunos5
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>>> "aa" in ["aa", "ab"]
1
>>> "aa" in ["aa"]
1
>>> "aa" in ("aa")
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
TypeError: 'in <string>' requires character as left operand

Is this a bug, or should this be consistent between lists and tuples?

Puzzled.