Re: [python-control-discuss] __repr__

[Rene v. P. <ren...@gm...>]

__str__ is for pretty printing
__repr__ is ideally for printing a representation that can directly be fed
back into Python to re-create the object. Many objects don't implement
that, though, it is basically limited to the standard Python objects.


On 10 June 2013 17:53, Ryan Krauss <rk...@si...> wrote:

> I probably won't get to this one for a few weeks (I have a conference and
> another paper coming up), but I would like to contribute a __repr__ method
> for TransferFunctions if it would be welcome.  I personally would prefer
> that when I type the name of a TransferFunction instance and hit enter that
> it pretty print an ascii numerator and denominator and a horizontal line.
>  It might be tricky to do it really nicely with exponents, but this is what
> happend now:
>
> In [2]: G = control.TransferFunction(1,[1,2])
>
> In [3]: G
> Out[3]: <control.xferfcn.TransferFunction instance at 0x10e94cf80>
>
> I then have to ask ro G.num and G.den separately, which I personally don't
> like.
>
> I see that there is a __str__ method which pretty much does what I would
> want, so that "print G" gives me an ascii representation.
>
> Is there any reason not to have __repr__ simply call __str__?  Is there
> some historical reason to have one and not the other?
>
> --
> Ryan Krauss, Ph.D.
> Associate Professor
> Mechanical Engineering
> Southern Illinois University Edwardsville
>
>
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René van Paassen        | ______o____/_|     Ren...@gm...
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