FAQ: Learn Python 2 - Introduction to Classes - Instantiate an Object

This community-built FAQ covers the “Instantiate an Object” exercise in Codecademy’s lessons on Python.

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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_triangle = Triangle( 45, 90, 45)
print my_triangle.number_of_sides
print my_triangle.check_angles()

I do not understand what is wrong with this. It is practically the same as the solution. I get the following error:

Traceback (most recent call last):
File “python”, line 15, in
File “python”, line 5, in init
AttributeError: ‘Triangle’ object has no attribute ‘angle1’

in the init method, you can define instance variable (self.angle1, self.angle2 and so forth).

variable you want to define should be at the left hand side of the assign operator:

self.angle1 = 'the value'
1 Like