On Thu, Aug 5, 2010 at 8:42 AM, wheres pythonmonks <wherespythonmo...@gmail.com> wrote: > How does "x is not None" make any sense? "not x is None" does make sense. > > I can only surmise that in this context (preceding is) "not" is not a > unary right-associative operator, therefore: > > x is not None === IS_NOTEQ(X, None) > > Beside "not in" which seems to work similarly, is there other > syntactical sugar like this that I should be aware of?
It's not quite the same type of sugar as that, but people sometimes forget that comparisons can be chained: if x < y <= z: Same as: if x < y and y <= z: # but y is only evaluated once Cheers, Chris -- http://mail.python.org/mailman/listinfo/python-list
