Yingjie Lan wrote: > 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.
http://docs.python.org/reference/expressions.html#notin """ Unlike C, all comparison operations in Python have the same priority, which is lower than that of any arithmetic, shifting or bitwise operation. Also unlike C, expressions like a < b < c have the interpretation that is conventional in mathematics: comparison ::= or_expr ( comp_operator or_expr )* comp_operator ::= "<" | ">" | "==" | ">=" | "<=" | "<>" | "!=" | "is" ["not"] | ["not"] "in" Comparisons yield boolean values: True or False. 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). """ Peter -- http://mail.python.org/mailman/listinfo/python-list