The first is how I would code it. Python guarantees that compound boolean statements are processed from left to right and also that the AND operator will "short circuit" the rest of the evaluation, since the rest of the line cannot change the falseness of the entire statement.
Orest Kozyar wrote: > Given a variable x that can either be None or a tuple of two floats [i.e. > (0.32, 4.2)], which syntax is considered most appropriate under Python > coding standards? > > if x and x[0] > 0: > pass > > =====OR===== > > if x: > if x[0] > 0: > pass > > > In the first, I'm obviously making the assumption that if the first > condition evaluates to false, then the second condition won't be evaluated. > But, is this a good/valid assumption to make? Is there a more appropriate > design pattern in Python? > > Thanks! > Orest > > _______________________________________________ > Tutor maillist - Tutor@python.org > http://mail.python.org/mailman/listinfo/tutor > _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
