Please help me, I'm not experienced with classes

It looks like your Triangle class doesn't have a number_of_sides member variable.

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


member variables are not declared/defined inside init method, member variables are declared directly inside the class

in your init method initialize the instance variable (self.angle1 and so on )

one other thing, two equal sign means check if is equal


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