On Thu, Oct 29, 2009 at 5:43 PM, metal <metal...@gmail.com> wrote: > '11' + '1' == '111' is well known. > > but it suprises me '11'+'1' IS '111'. > > Why? Obviously they are two differnt object. > > Is this special feature of imutable object?
It's an implementation detail used to optimize performance. CPython caches certain small strings and returns the same object when asked for a string with identical content to one in the cache, thus the behavior you're observing. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
