On Sun, Nov 11, 2012 at 6:33 AM, Jennie <namedotpor...@gmail.com> wrote:
> ... def distance(self, point=None):
> ... p = point if point else Point()
I'd go with this one. Definitely not the third one, which mutates the
class according to a current global every time a Point is instantiated
- could be *extremely* confusing if the name distance were ever
rebound. You could also fiddle with the default args:
>>> class Point:
def __init__(self, x=0, y=0):
self.x = x
self.y = y
def __sub__(self, other):
return Point(self.x - other.x, self.y - other.y)
def distance(self, point="Point()"):
return math.sqrt((self - p).x ** 2 + (self - p).y ** 2)
>>> Point.distance.__defaults__=Point(), # has to be a tuple
ChrisA
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