Currently __trunc__ is used for two purposes:
* In math.trunc() which just calls __trunc__.
* In int() and PyNumber_Long() as a fallback if neither __int__ nor
__index__ are implemented.
Unlike to __int__ and __index__ there is not a slot corresponding to
__trunc__. So using it is slower than using __int__ or __index__. float
and Decimal implement __int__ and __trunc__ by the same code. Only
Fraction implements __trunc__ but not __int__.
I propose to deprecate the falling back to __trunc__ for converting to
int and remove it in future. Fraction should implement __int__.
We cannot use __trunc__ for setting the nb_int slot because it can
return non-int.
_______________________________________________
Python-Dev mailing list -- python-dev@python.org
To unsubscribe send an email to python-dev-le...@python.org
https://mail.python.org/mailman3/lists/python-dev.python.org/
Message archived at
https://mail.python.org/archives/list/python-dev@python.org/message/6ZMQE4YTFZWN7H366YJG5QFNP6TFPMFZ/
Code of Conduct: http://python.org/psf/codeofconduct/
