Fault trees structure

Jeff Epler jepler at inetnebr.com
Tue Dec 12 22:47:40 EST 2000

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)
>>>> 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.  :(


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