From now on, for each operator I would have to remember wether it
is a supposedly comparison operator or not.
I believe the following rule is true: if a op b is True or False raises,
then op is a potentially chained comparison operation. They are (not)
equal (and (not) is), the 4 order comparisons, and (not) in. 'in' should
be the only surprise and most confusing.
>>> 1 < 3 in {3,4}
True
>>> 3 in {3,4} < {4}
False
'and' and 'or' are not included because they do not always return a
bool, and indeed, they are not binary operators in the usual sense
because of short-circuiting.
--
Terry Jan Reedy
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