class Triangle(object): def __init__(self, angle1, angle2, angle3): self.angle1 = angle1 self.angle2 = angle2 self.angle3 = angle3 number_of_sides = 3 def check_angles(self, angle1, angle2, angle3): if self.angle1+self.angle2+self.angle3==180: return True else: return False
Oops, try again. It looks like your Triangle class doePreformatted text`sn't have a number_of_sides member variable.
I don't understand what is wrong... I tried also with only def(check_angles(self): ...