ripley wrote: > Boris Borcic wrote: > >>[EMAIL PROTECTED] wrote: >> >>>>>>class A: >>> >>>... pass >>>... >>> >>>>>>a = A() >>>>>>b = a >>>>>>del b >>>>>>a >>> >>><__main__.A instance at 0x00B91BC0> >>>I want to delete 'a' through 'b', why It does't? >>>How can I do that? >> >>del a,b > > > But 'b' is also deleted, i want use 'b' to delete 'a', 'b' is exists. > You can't do what you want to do.
Python names are independent references to objects. The "del" statement deletes a name from a namespace (or an item from a structure), and cannot be used to delete all references to a given object. In general there's no way to delete a referenced object - we normally rely on the implementation (in CPython reference counting plus garbage collection, in other implementations just plain garbage collection) to perform the deletion when no live references to an object remain. Perhaps you'd like to explain *why* you find a need to do this (in other words, what's your use case)? Weak references are one possibility that might help you, but without knowing your real requirements it's difficult to be more helpful. regards Steve -- Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Love me, love my blog http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden -- http://mail.python.org/mailman/listinfo/python-list
