FAQ: Learn Python - Introduction to Classes - Class It Up

This community-built FAQ covers the “Class It Up” exercise in Codecademy’s lessons on Python.

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Why does the method check_angles only take the argument self (i.e. def check_angles(self): ) as opposed to the three angles (i.e. def check_angles(self, angle1, angle2, angle3):). Is it because the angles must be provided to exist in the triangle class?

Additionally, why is it not possible to use:

if angle1 + angle2 + angle 3 == 180

as opposed to:

if (self.angle1 + self.angle2 + self.angle3) == 180:

since we previously defined self.angle = angle in the init() ?

1 Like

Because self is the context of the angles for that instance. We don’t need to pass them in, only access the instance variables.

Those variables do not exist in the context of the instance. When we first create the instance the variables are available, but if we return to the method at some time later, they will not. Only their self.attributes still exist.