Guido van Rossum added the comment: OK, let's not try to resolve that issue, we can just note it in the docs. BTW I don't want repr() of a complex number to use the complex(..., ...) notation -- it's too verbose.
On Tue, Jan 13, 2015 at 11:38 AM, Serhiy Storchaka <rep...@bugs.python.org> wrote: > > Serhiy Storchaka added the comment: > > > Another possible "fix" is to introduce a new 'imaginary' type, such that > the type of an imaginary literal is now 'imaginary' rather than 'complex', > and arithmetic operations like addition can special-case the addition of a > float to an 'imaginary' instance to produce a complex number with exactly > the right bits. The C standardisation folks already tried this: C99 > introduces optional "imaginary" types and a new _Imaginary keyword, but > last time I looked almost none of the popular compilers supported those > types. (I think Intel's icc might be an exception.) While this works as a > technical solution, IMO the cure is worse than the disease; I don't want to > think about the user-confusion that would result from having separate > "complex" and "imaginary" types. > > This type should exist only at compile time. Peephole optimizer should > replace it with complex after folding constants. > > Or may be repr() (and str()) should keep zero real part if imaginary part > is negative and output period if real part is zero. For now: > > >>> z = complex(0.0, 3.4); z; eval(repr(z)) > 3.4j > 3.4j > >>> z = complex(0.0, -3.4); z; eval(repr(z)) > -3.4j > (-0-3.4j) > >>> z = complex(-0.0, 3.4); z; eval(repr(z)) > (-0+3.4j) > 3.4j > >>> z = complex(-0.0, -3.4); z; eval(repr(z)) > (-0-3.4j) > -3.4j > > But all this perhaps is offtopic here. > > ---------- > > _______________________________________ > Python tracker <rep...@bugs.python.org> > <http://bugs.python.org/issue23229> > _______________________________________ > ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue23229> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
