> I think you need to elaborate on your use cases further, ... A frozendict can be used as a member of a set or as a key in a dictionary.
For example, frozendict is indirectly needed when you want to use an object as a key of a dict, whereas one attribute of this object is a dict. Use a frozendict instead of a dict for this attribute answers to this problem. frozendict helps also in threading and multiprocessing. -- > ... and explain > what *additional* changes would be needed, such as allowing frozendict > instances as __dict__ attributes in order to create truly immutable > objects in pure Python code. > In current Python, you *can't* create a truly immutable object without > dropping > down to a C extension: Using frozendict in for type dictionary might be a use case, but please don't focus on this example. There is currently a discussion on python-ideas about this specific use case. I first proposed to use frozendict in type.__new__, but then I proposed something completly different: add a flag to a set to deny any modification of the type. The flag may be set using "__final__ = True" in the class body for example. Victor _______________________________________________ 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
