[Python] AttributeError after updating attributes of python object [closed]

class Composition:

def __init__(self,title):
self.title=title
self.type=0
self.tone=''
self.mode=''
...
self.harp=0
self.saxophone=0

def getharp(self):
return self.harp


I thought of adding additional attributes to the Composition object, but when I try to run a program with a Composition object, I get an attribute error: Composition object has no attribute harp.

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