On Tue, Nov 11, 2008 at 11:16 AM, RinKaMeAri <[EMAIL PROTECTED]> wrote: > On Nov 11, 9:12 pm, Steve Holden <[EMAIL PROTECTED]> wrote: >> RinKaMeAri wrote: >> > Hi! >> > Could you imagine any way to block access to the base class public >> > methods? >> > Here is an example: >> > class B: >> > def public_method(): >> > pass >> >> > class A(B): >> > def public_a_method(): >> > pass >> >> > def a = A() >> >> > Is there any way to block the call a.public_method() without any >> > changes to B class? >> > Thank you! >> >> The simplest way would be to override B.public_method within A by >> defining A.public_method to raise a NotImplementedError or similar >> exception. Though of course this then begs the question of why A would >> need to subclass B in the first place, but I assume there would be >> methods you *did* want to implement. >> <snip> > > BTW, what do you mean "to subclass B in the *first place*"?
Because you're inheriting from A and yet you don't want to inherit a certain part of A, in this case public_method(), it's usually a sign something is wrong with your class hierarchy; otherwise, you could just inherit from something else which would have just the part of A you want to inherit; it's a so-called "code smell", specifically Refused Bequest I believe. See this link into Fowler's Refactoring for more info on Refused Bequest and the other code smells: http://books.google.com/books?id=1MsETFPD3I0C&pg=PA87&lpg=PA87&dq=refused+bequest&source=bl&ots=pKN4o0QJc7&sig=rYT4lfWxhKijvNHpLYqk8DY5Epw&hl=en&sa=X&oi=book_result&resnum=3&ct=result Cheers, Chris -- Follow the path of the Iguana... http://rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
