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.

FAQs for the Codecademy Python exercise Instantiate an Object:

Join the Discussion. We Want to Hear From You!

Have a new question or can answer someone else’s? Reply (reply) to an existing thread!

Agree with a comment or answer? Like (like) to up-vote the contribution!

Need broader help or resources about Python in general? Go here!

Want to take the conversation in a totally different direction? Join our wider discussions.

Learn more about how to use this guide.

Found a bug? Report it!

Have a question about your account, billing, Pro, or Pro Intensive? Reach out to our support team!

None of the above? Find out where to ask other questions here!

Other FAQs

The following are links to additional questions that our community has asked about this exercise:

  • This list will contain other frequently asked questions that aren’t quite as popular as the ones above.
  • Currently there have not been enough questions asked and answered about this exercise to populate this FAQ section.
  • This FAQ is built and maintained by you, the Codecademy community – help yourself and other learners like you by contributing!

Not seeing your question? It may still have been asked before – try searching for it by clicking the spyglass icon (search) in the top-right of this page. Still can’t find it? Ask it below by hitting the reply button below this post (reply).

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
      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