How to detect that a function argument is the default one

[Jean-Michel Pichavant]

----- Original Message -----
> From: "ast" <nomail at invalid.com>

> >
> >> Note : what is the mass of a circle ?
> >
> 
> In fact it's a ball moving in a plan.
> I will change that name.

I would advise to remove the the mass parameter of your Sphere initialization. It could be inconsistent with the radius.
To compute the mass you would need the radius and the  volumetric mass density.

pseudo code:

class Sphere(object):
  def __init__(self, center, radius, density):

  @property
  def volume(self):
    return 4/3.*pi*self.radius^3

  @property
  def mass(self):
    return self.volume*self.density

You'll find no the net the density for most of the materials.

JM


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