On Tue, May 13, 2008 at 5:57 PM, Nikhil <[EMAIL PROTECTED]> wrote: > __len__() is a built-in function of the list object and is updated along > with the list object elements and will be useful incase the list is very > huge. > > len() is an external method again, which may require the processing cycles > again.
The purpose of obj.__len__() is to implement len(obj), which simply calls it. So obj.__len__() may be faster, but only marginally. The reason to prefer len(obj) is that if you inadvertently pass an object that does not implement __len__, you get the more appropriate TypeError rather than an AttributeError. -- http://mail.python.org/mailman/listinfo/python-list
