Tim Peters <t...@python.org> added the comment: This report appears to be the same:
https://bugs.python.org/issue27463 One other thing to note: the Python docs are sometimes unclear about whether expressions are intended to be interpreted as Python code or as mathematical expressions. In: """ floor division will be implemented in all the Python numeric types, and will have the semantics of: a // b == floor(a/b) """ note that it did _not_ say `math.floor(a/b)`. `floor(a/b)` here is intended to be read as a mathematical (infinitely precise) specification. As can be inferred from the output Serhiy posted, after the Python a = 0.9 b = 0.1 the infinitely precise value of `a/b` is a tiny bit less than 9, so the infinitely precise value of `floor(a/b)` is exactly 8. Which is what the Python `a // b` returns. Personally, I wish Python 3 had changed the meaning of `//` (and `divmod()` and `%` - the three are deeply related) for floats, but too late for that now :-) ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue32543> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
