On Thu, 02 Jun 2011 10:55:49 -0500, harrismh777 wrote: > Steven D'Aprano wrote: >> What do you expect this code to do? >> >> a = 42 >> funcs = [(lambda x: x+a) for i in range(10)] funcs[0](1) > > I do see your point with this... truly... but it did get me to think > about what I *do* expect... and that is that 'a' (for the lambda) will > be whatever 'a' is (now) at the time when the anonymous function is > returned, not later when it is called (not really).
Arguably, there's nothing wrong with early binding as a strategy. It's just a different strategy from late binding. It seems to me that early binding is less flexible than late, because with late binding you have a chance to simulate early binding by saving a reference of the variable elsewhere, such as in a default value, or an instance attribute. But with early binding, you're stuck. There's no simple or straightforward way to simulate late binding in an early binding language. -- Steven -- http://mail.python.org/mailman/listinfo/python-list
