[PyFeyn] Installation PyFeyn

[Georg von Hippel]

Dear Florian,

Thank you for your bug report. Unfortunately, PyX does not provide a 
particularly stable interface -- in version 0.11.1 (the most recent one I 
tested PyFeyn with), the boolean argument to _arrowhead() that this error 
isindicating as missing did not exist, and the call as implemented in 
Arrow.decorate() was correct. I don't really know what to do about this 
kind of problem other than to mandate a particular version of PyX to be 
used with PyFeyn, which would seem a bit heavy-handed ...

I recommend you install PyX version 0.11.1 to use PyFeyn.

Best wishes,

    Georg

-- 
============================================================================

  Dr. Georg von Hippel
  Institut für Kernphysik                 Phone:  +49 6131 39-22933
  Johannes Gutenberg-Universität Mainz    Fax:    +49 6131 39-22964
  Johann-Joachim-Becher-Weg 45            Email:  hippel at kph.uni-mainz.de
  55099 Mainz, Germany

============================================================================


On Fri, 6 Dec 2013, floczko wrote:

> Hi all,
>
> I wanted to try out pyfeyn but I cannot make it work on my mac.
> I have the rights on my machine therefore I installed pyx system wide by using
>
> sudo python setup.py install
>
> then I install pyfeyn in the same way.
>
> Now when I copy the first example on the page and run it I have an error happening on the last command i.e.
>
> fd.draw("pyfeyn-test1.pdf")
>
>
> Traceback (most recent call last):
>  File "test.py", line 27, in <module>
>    fd.draw("pyfeyn-test1.pdf")
>  File "/Library/Python/2.7/site-packages/pyfeyn/diagrams.py", line 69, in draw
>    c = self.drawToCanvas()
>  File "/Library/Python/2.7/site-packages/pyfeyn/diagrams.py", line 61, in drawToCanvas
>    obj.draw(self.currentCanvas)
>  File "/Library/Python/2.7/site-packages/pyfeyn/lines.py", line 329, in draw
>    canvas.stroke(path, styles)
>  File "/Library/Python/2.7/site-packages/pyx/canvas.py", line 298, in stroke
>    self.draw(path, [deco.stroked]+list(attrs))
>  File "/Library/Python/2.7/site-packages/pyx/canvas.py", line 284, in draw
>    adeco.decorate(dp, self.texrunner)
>  File "/Library/Python/2.7/site-packages/pyfeyn/deco.py", line 28, in decorate
>    1, self.size, 45, constrictionlen)
> TypeError: _arrowhead() takes exactly 7 arguments (6 given)
>
> Now when I run it I do have the warning message :
>
> You don't have PyX - that's a problem unless you're just running the setup script.
>
> even though when I do import pyx I import the module without any problem.
>
> I executed all the line one by one in ipython and there is really only the draw command that do not work.
>
> Thanks in advance for your help,
>
> Best,
>
> Florian Lyonnet
>
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