How to detect that a function argument is the default one

[Ian Kelly]

On Wed, Dec 10, 2014 at 9:10 AM, Jean-Michel Pichavant <
jeanmichel at sequans.com> wrote:
> If you like one-liners,
>
> def __init__(self, center=(0,0), radius=10, mass=None):
>     self.center = center
>     self.radius = radius
>     self.mass = (mass is None and radius**2) or mass

If mass is None and radius is 0, then self.mass gets set to None. Use the
actual ternary operator instead.
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