On 15 April 2016 at 18:54, Jim J. Jewett <jimjjew...@gmail.com> wrote: > > [2A] Do you want to promise that replacing a value with a > non-identical object *will* trigger a version_tag update *even* > if the objects are equal? > > I would vote no, but I realize backwards-compatibility may create > such a promise implicitly.
It needs to trigger a version update. Equality doesn't guarantee any kind of equivalence in Python. It's not even guaranteed that a==b will come to the same value if evaluated twice in a row. An example: >>> from fractions import Fraction as F >>> F(1) == 1 True >>> d = globals() >>> d['a'] = F(1) >>> a.limit_denominator() Fraction(1, 1) >>> d['a'] = 1 >>> a.limit_denominator() Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'int' object has no attribute 'limit_denominator' -- Oscar _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
