Steven D'Aprano <[EMAIL PROTECTED]> writes:
> Anyone have any good ideas for how I should implement this?
These days you can use properties. Before, you'd have had to do it
manually with __setattr__ / __getattr__ methods. Here's how I'd do it
with properties, if I have the math right. You're using a and b as
the canonical values of the variables, computing x and y from them,
and adjusting them when x and y change.
class Parrot(object):
x = property(getx, setx)
y = property(gety, sety)
def getx(self):
return self.a + self.b
def setx(self, x):
y = self.y # calls gety
self.a, self.b = 2*x - y, y-x
def gety(self):
return self.a + 2*self.b
def sety(self, y):
x = self.x # calls getx
self.a, self.b = 2*x - y, y-x
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