On Feb 16, 3:48 pm, Dan Bishop <[EMAIL PROTECTED]> wrote: > On Feb 15, 10:24 am, nexes <[EMAIL PROTECTED]> wrote: > > > > > Alright so me and my friend are having argument. > > > Ok the problem we had been asked a while back, to do a programming > > exercise (in college) > > That would tell you how many days there are in a month given a > > specific month. > > > Ok I did my like this (just pseudo): > > > If month = 1 or 3 or etc .... > > noDays = 31 > > Elseif month = 4 or 6 etc .... > > noDays = 30 > > Else > > noDays = 29 > > (we didn't have to take into account a leap year) > > > He declared an array and assigned the number of days in a month to its > > own element in an array. Now > > I realise that in this example it would not make a difference in terms > > of efficiency, but it is my belief that if > > there is more data that needed to be assigned(i.e. a couple megs of > > data) it would be simpler (and more efficient) to > > do a compare rather then assigning all that data to an array, since > > you are only going to be using 1 value and the rest > > of the data in the array is useless. > > > What are everyone else's thoughts on this? > > days_in_month = lambda m: m - 2 and 30 + bool(1 << m & 5546) or 28
Alternatively: days_in_month = lambda m: m - 2 and 31 - ((m + 9) % 12 % 5 % 2) or 28 the guts of which is slightly more elegant than the ancient writing from which it was derived: MOD(MOD(MOD(M+9,12),5),2) -- http://mail.python.org/mailman/listinfo/python-list
