On Mon, Apr 12, 2010 at 9:16 PM, kirby urner <kirby.ur...@gmail.com> wrote:
<< snip >>
OK, a couple replies to this one:
> (a) I found the bug: I'd neglected to subclass 'object' as my root object,
> so was not getting new-style classes, just classic classes -- we still
> have that distinction in 2.6.
I was also mistakenly passing 'self' as a first parameter to
super(Type, self).__init__.
> (b) I made numerous enhancements for this new improved deluxe
> edition, appended herewith:
>
Here's the output you get if you run it as is, except the alignment
here is messed up (not a fixed width font for me here):
Volumes Table
=============
Tetrahedron (edge = 1) 1
Cube (any face diagonal = 1) 3
Octahedron (any edge = 1) 4
Rhombic Triacontahedron (any long face diagonal = 0.6177) 5
Rhombic Dodecahedron (any long face diagonal = 1) 6
Rhombic Triacontahedron (any long face diagonal = 0.7071) 7.5
Pentagonal Dodecahedron (any edge = 0.618) 15.35
Icosahedron (any edge = 1) 18.51
Cuboctahedron (any edge = 1) 20
Duals Table
==========
Tetrahedron* Tetrahedron
Cube* Octahedron
Octahedron* Cube
Rhombic Dodecahedron Cuboctahedron
Rhombic Triacontahedron Icosidodecahedron
Pentagonal Dodecahedron* Icosahedron
Icosahedron* Pentagonal Dodecahedron
Cuboctahedron Rhombic Dodecahedron
* = Platonic
> def scale(self, scalefactor):
> edge = self.edge * scalefactor # edge unbound to self
> volume = self.volume * pow(scalefactor, 3) # likewise volume
> # print("DEBUG: a star is born: a new %s" % self.__class__.__name__)
> return self.__class__(edge = edge, edge_name = self.edge_name,
> volume = volume, greekname = self.greekname)
Found a bug already: the scale method had yet to pass on its full complement
of parameters when giving birth to a scaled version of itself. Here's what
I changed it to:
def scale(self, scalefactor):
edge = self.edge * scalefactor # edge unbound to self
volume = self.volume * pow(scalefactor, 3) # likewise volume
# print("DEBUG: a star is born: a new %s" % self.__class__.__name__)
return self.__class__(*(edge, self.edge_name, volume, self.greekname,
self.platonic, self.dual))
Testing (old code):
>>> t = Tetra()
>>> t.dual
'Tetrahedron'
>>> t.volume
1
>>> newt = t.volume * 3
>>> newt.dual
Traceback (most recent call last):
File "<pyshell#43>", line 1, in <module>
newt.dual
AttributeError: 'int' object has no attribute 'dual'
>>> newt.platonic
Traceback (most recent call last):
File "<pyshell#44>", line 1, in <module>
newt.platonic
AttributeError: 'int' object has no attribute 'platonic'
Testing (new code):
>>> reload(ch)
<module 'ch' from 'C:\Python26\Lib\site-packages\ch.pyc'>
>>> t = Tetra()
>>> t = 3 * t
>>> t.volume
27
>>> t.dual
'Tetrahedron'
>>> t.platonic
True
>>> c = Cube()
>>> c = c * 3
>>> c.volume
81
>>> c.platonic
True
>>> d = ch.R_Dodeca()
>>> d.platonic
False
>>> e = d * 5
>>> e.volume
750
>>> e.platonic
False
>>> e.dual
'Cuboctahedron'
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