Re: [python-control-discuss] __repr__

[Ryan K. <rk...@si...>]

> __repr__ is ideally for printing a representation that can directly be
fed back into Python to > re-create the object.

I guess I didn't realize this convention.  Like you said, I don't think it
is typically followed.  When I want to look at a variable at the IPython
prompt, I am not used to having to type print in front of it.


--
Ryan Krauss, Ph.D.
Associate Professor
Mechanical Engineering
Southern Illinois University Edwardsville


On Tue, Jun 11, 2013 at 2:37 PM, Rene van Paassen <ren...@gm...
> wrote:

> __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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>
>
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