example.py

class Triangle(object):
  number_of_sides = 3 
  def __init__(self, angle1, angle2, angle3):
      angle1 = self.angle1
      angle2 = self.angle2
      angle3 = self.angle3
      
  def check_angles(self):
      if self.angle1 + self.angle2 + self.angle3 == 180:
          return True
      else: 
          return False

my_trangle = Triangle(90,30,60)

print my_triangle.number_of_sides

print my_trangle.check_angles()