Actually, after saying I was opposed to __bin__ in 2.6, I said: "Instead, I think the approach used in 3.0 (r64451) should be used instead. That is, if this feature exist at all. I'm -0 on adding bin(), etc. to floats." My last sentence is a little unclear. I meant I'm -0 on adding floats as arguments to bin(), oct(), and hex(). Primarily because a) it's not extensible in 3.0, and b) I find it surprising, in that I'd expect those functions to throw an error for non-integral types (that is, those not having __index__). I think adding a "float_as_binary_expression()" (with a better name) in some module would get the functionality you seek. What is gained by adding this to bin() and friends? Raymond Hettinger wrote: > From: "Guido van Rossum" <guido at python.org> >> I don't care about the details of the patch until we have agreement >> about which form the feature should take. We don't have that agreement >> yet. > > Updated to the patch to address everyone's review comments: > http://bugs.python.org/file10742/float8.diff > > * Alexander Belopolsky requested exponential notation instead of > potentially very long strings of bits. Done > > * Alexander Belopolsky requested true mathematical radix 2 > representation of a float rather than its 64-bit memory layout. Done > > * Antoine Pitrou requested that hex() and oct() be supported as well as > bin(). Terry J. Reedy also requested support for hex(). Done. > > * Alexander Belopolsky and Alexandre Vassalotti requested that the > output be a two-way street -- something that can be round-tripped > through eval(). Done. > > * Amaury Forgeot d'Arc requested that the implementation not manipulate > C strings inplace. Fixed -- used PyUnicode_FromFormat() instead. > > * Amaury Forgeot d'Arc requested that tests should check if negative > numbers have the same representation as their absolute value. Done. > > * Mark Dickinson requested sign preserving output for bin(-0.0). We > couldn't find a clean way to do this without a special cased output format. > > * Mark Dickinson reviewed the NaN/Inf handling. Done. > > * Eric Smith requested that the routine be attached to > _PyFloat_to_base() instead of attaching to __bin__, __oct__, and > __hex__. Done. > > * Guido requested that the docs be updated. Done. > > * Guido requested that the globally visible C API function name be > prefixed with _Py. Done. > > * Mark Dickinson requested normalizing output to start with a 1 so that > nearby values have similar reprs. Done. > > > Raymond > _______________________________________________ > Python-Dev mailing list > Python-Dev at python.org > http://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > http://mail.python.org/mailman/options/python-dev/eric%2Bpython-dev%40trueblade.com > >
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