On 2006-11-08, Georg Brandl <[EMAIL PROTECTED]> wrote: > Peter van Kampen schrieb: >> On 2006-11-06, Fredrik Lundh <[EMAIL PROTECTED]> wrote: >>> I've collected a bunch of list pydioms and other notes here: >>> >>> http://effbot.org/zone/python-list.htm >> >> """ >> A = B = [] # both names will point to the same list >> """ >> >> I've been bitten by this once or twice in the past, but I have always >> wondered what it was useful for? Can anybody enlighten me? > > Do you never have a situation where you want to assign the same value > to two variables?
In the sense that I might want two empty lists or maybe 2 ints that are initialised as 0 (zero). That's what I (incorrectly) thought A = B = [] did. > Or are you objecting to the fact that both names point to the same > object? I'm not objecting to anything, merely wondering when I could/should use this idiom. There's a nice example in another response (self.items = items = []) > It couldn't be otherwise. Consider: > > X = [] > A = B = X > > What should this do? Copy "X" and assign one copy to A, one to B? Ah yes, I see the error in my ways...I skipped the A = B part too lightly. Thanks, PterK -- Peter van Kampen pterk -- at -- datatailors.com -- http://mail.python.org/mailman/listinfo/python-list
