Yingjie Lan writes: > I am not sure how to interprete this, in the interactive mode: > > >>> 3>0 is True > False > >>> (3>0) is True > True > >>> 3> (0 is True) > True > > Why did I get the first 'False'? I'm a little confused.
It is interpreted as equivalent to this: >>> 3 > 0 and 0 is True False >From the language reference at python.org (section 5.9 Comparisons): expressions like a < b < c have the interpretation that is conventional in mathematics ... Comparisons can be chained arbitrarily, e.g., x < y <= z is equivalent to x < y and y <= z, except that y is evaluated only once (but in both cases z is not evaluated at all when x < y is found to be false). <URL:http://docs.python.org/reference/expressions.html#notin> -- http://mail.python.org/mailman/listinfo/python-list