On Thursday, April 30, 2015 at 8:19:39 AM UTC+2, Martin R wrote:
>
> I'm only trying to understand. Yes, I assume it happens that someone is
> using sage as a python library and then possibly only wants repr.
>
If you use Sage as a Python library then you are in control of the
displayhook. The Python default which will only use __repr__. Your
application can change that of course.
So the point really is that, at least for me personally, having rich_repr
>>> return graphics in the console (for any object, not only graphs) is very
>>> very undesirable.
>>>
>> Presumably you find it desirable to display Graphics() objects (the
>> return value of plot()) as picture, so there is that.
>>
> Of course. Hence, _rich_repr_ (or _repr_) should not return a Graphics
> object, right?.
>
Graphics() is the base class for (2d) graphics in Sage. It does more than
just draw pictures, you can also save them in different image file formats,
play with axes, etc. The _rich_repr_() method never returns Graphics, it
uses its own class hierarchy to encapsulate a particular type of rich
output that is supported by the backend.
sage: p = plot(sin)
sage: type(p)
<class 'sage.plot.graphics.Graphics'>
sage: p_repr = p.__repr__()
sage: type(p_repr)
<type 'str'>
sage: dm = sage.repl.rich_output.get_display_manager()
sage: p_rich_repr = p._rich_repr_(dm)
sage: type(p_rich_repr)
<class 'sage.repl.rich_output.output_graphics.OutputImagePng'>
sage: dm.preferences.graphics = 'vector'
sage: type(p._rich_repr_(dm))
<class 'sage.repl.rich_output.output_graphics.OutputImagePdf'>
sage: dm.supported_output()
frozenset({<class 'sage.repl.rich_output.output_basic.OutputPlainText'>,
<class 'sage.repl.rich_output.output_basic.OutputAsciiArt'>,
<class 'sage.repl.rich_output.output_basic.OutputLatex'>,
<class 'sage.repl.rich_output.output_graphics.OutputImagePng'>,
<class 'sage.repl.rich_output.output_graphics.OutputImageGif'>,
<class 'sage.repl.rich_output.output_graphics.OutputImagePdf'>,
<class 'sage.repl.rich_output.output_graphics.OutputImageDvi'>,
<class
'sage.repl.rich_output.output_graphics3d.OutputSceneJmol'>,
<class
'sage.repl.rich_output.output_graphics3d.OutputSceneWavefront'>})
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