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class Point:
def __init__(self, x=0, y=0, z=0):
self.x = x
self.y = y
self.z = z
def __str__(self):
return "({x}, {y}, {z})".format(x=self.x, y=self.y, z=self.z)
def isAtInfinity(self):
return self.y == 0
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