Output is correct but get Codecademy error message


My code looks like the following:

class Triangle(object):
    number_of_sides = 3
    def __init__(self, angle1, angle2, angle3):
        self.angle1 = angle1
        self.angle2 = angle2
        self.angle3 = angle3
    def check_angles(self):
        return self.angle1 + self.angle2 + self.angle3 == 180
    my_triangle = Triangle(30, 60, 90)
    print my_triangle.number_of_sides
    print my_triangle.check_angles()

The output to the console looks like:


which I believe to be correct; however, I keep getting a message from Codecademy that says, "Oops, try again. Did you create an instance of Triangle called my_triangle?" uhhhhh, no?


Ah never mind, I made the same indentation mistake as https://www.codecademy.com/forum_questions/55c10ee393767648190003f2