On Wed, Sep 2, 2009 at 6:30 AM, Anthony Casey<amca...@xtra.co.nz> wrote: > Hello, tutors. > > I'm someone who used to programme as a hobby and who is trying to get back > into it via Python. I'm reading Programming in Python 3 by Summerfield > (excellent book). > > I read something unusual about Boolean operations in Python: > >>>> five = 5 >>>> two = 2 >>>> zero = 0 >>>> five and two > 2 > > I understand what it's doing here: returning the operand. But what is the > practical application of that? How might I use that function? (Short-sighted > imagination, I realise.)
The equivalent behaviour for 'or' can be used to provide a default, for example: value = may_be_empty or 3 The obsolete (and problematic) hack for a ternary expression uses this: x = (cond and true_value) or false_value If cond evaluates to True, x will have true_value, otherwise it will have false_value. Kent _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
