Need to add some points to the @Frédéric 's answer.
do return one of their operands???
It is True but that is not the logic behind this. In python a number except 0 is considered as True and number 0 is considered as False.
(0 and 42 -> False and True) = False.
That's why it returns 0.
(0 or 42-> false or True) = 42
In that case the statement will be True because of the operand 42. so python returns the operand which causes the statement to be true, in that case.
