Thank you for reviewing my proposal. First and foremost, let me address the use case for this feature. I have an `SQL` database where I store `itertools.cycle` objects (via pickling) and I use SQLAlchemy to interact with this database. Whenever I "update" the cycler, by calling `next` on the cycler, SQLAlchemy detects whether or not a change has occurred by comparing the "new" object and the "old" object via the `__eq__` method to determine whether the object needs to be updated in the `SQL` database. Since these objects are the still same via` __eq__` operator, no change is detected thus causing SQLAlchemy to no update the cycler in the database.
Here an example of this situation ```python thing = session.get(Thing, 123) # thing.cycler is the itertools.cycle object in the database cycler = thing.cycler value_i_want = next(cycler) # SQLAlchemy only attempts to check if a change has occurred # in the __setattr__ method which is why this line is here thing.cycler = cycler ``` You bring up a good point regarding how to determine iterable equality. For example, with your last example, I had no idea that the same iterable behavior could produce radically different results between cyclers. To be quite honest, I don't really understand what causing this quirky behavior. Perhaps this is more of an issue with SQLAlchemy as opposed to an issue with `itertools.cycle`. Maybe somehow SQLAlchemy can insert a callback function into the __next__ method letting it know that in fact `thing.cycler` was updated and should be updated in the SQL database the next call to `session.commit()` Anyway thank you for all your help and thorough analysis of my request! Andres _______________________________________________ Python-ideas mailing list -- python-ideas@python.org To unsubscribe send an email to python-ideas-le...@python.org https://mail.python.org/mailman3/lists/python-ideas.python.org/ Message archived at https://mail.python.org/archives/list/python-ideas@python.org/message/FKRJIZFUBFO2V22ES3GZJMR5FN4SONSY/ Code of Conduct: http://python.org/psf/codeofconduct/
