Using __repr__ or __str__ for own printable class?

[Irmen de Jong]

Peter Hansen wrote:
> Irmen de Jong wrote:
> 
>>[offtopic]
>>
>>Erik Max Francis wrote:
>>
>>
>>>>>>Course(lowEarthOrbit, lowMarsOrbit).transfers()
>>>
>>>[<ExtractionTransfer @ 0x82893ac (out of `low orbit around `Earth'')>,
>>><HohmannTransfer @ 0x812cef4 (Hohmann from `Earth' to `Mars')>,
>>><InsertionTransfer @ 0x82adb64 (into `low orbit around `Mars'')>]
>>>
>>
>>Is this actual code? What does this do? I'm interested.
> 
> 
> Given that Python is an "agile language", it seems very likely that
> it must be an implementation of Robert Zubrin's XP-style "Mars Direct" 
> program for a manned mission to Mars.  
> 
> <0.9 wink but I wish it were lower-ly y'rs> 
> 
> -Peter

I *was* serious...
If it is real code I suspect it somehow determines a path for a
free moving object in space to transfer from one orbit to another
orbit around different bodies in the solar system.
At least that is what a quick google for "Hohmann orbit transfer"
tells me. And I'm still interested ;-)

--Irmen