comparing booleans

[Erik Max Francis]

Dang Griffith wrote:

> Not that I've never used this (cool) Python syntax in practice,
> but I thought it was worth mentioning that using != and ^ in
> boolean expressions does not always give the same result.  It does
> give the same result when there are only two operands.

This is because of operator chaining, which only exists a special case
for the relational operators (==, !=, <, <=, >, >=).  It's not actually
a difference in the truth table; it's because chaining operators behave
differently than other operators.

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