Nick Coghlan wrote: >Anders J. Munch wrote: > >>Note that __with__ and __enter__ could be combined into one with no >>loss of functionality: >> >> abc,VAR = (EXPR).__with__() >> > >They can't be combined, because they're invoked on different objects. >
Sure they can. The combined method first does what __with__ would have done to create abc, and then does whatever abc.__enter__ would have done. Since the type of 'abc' is always known to the author of __with__, this is trivial. Strictly speaking there's no guarantee that the type of 'abc' is known to the author of __with__, but I can't imagine an example where that would not be the case. >It would >be like trying to combine __iter__() and next() into the same method for >iterators. . . The with-statement needs two pieces of information from the expression: Which object to bind to the users's variable (VAR) and which object takes care of block-exit cleanup (abc). A combined method would give these two equal standing rather than deriving one from the other. Nothing ugly about that. - Anders _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
