Fault trees structure

[Jeff Epler]

On Tue, 12 Dec 2000 13:18:58 -0500, Darrell Gallion
 <darrell at dorb.com> wrote:
>Not sure that values will be constrained to boolean.
>
>When I tried this something odd happened.
>None isn't valid for and_ while it is for "and"
>
>>>> and_(1, 1)
>1
>>>> and_(None, 1)
>Traceback (most recent call last):
>  File "<stdin>", line 1, in ?
>TypeError: bad operand type(s) for &
>>>> None and 1
>>>>

Well, operator.and_ corresponds to writing
	x & y
what you're looking for is the function in operator which means
	x and y
but that doesn't seem to exist.  :(

Jeff