AttributeError: 'set' object has no attribute 'items'
As you can see from the latest updated code -
self.changes = {"MTMA",123}When you define self.changes as above , you are actually defining a set , not a dictionary , since you used ',' (comma) instead of colon , I am pretty sure in your actual code you are using comma itself , not colon .
To define a dictionary with "MTMA" as key and 123 as value , use a colon in between them , Example -
self.changes = {"MTMA":123}Do similarly in your actual code as well.
If what you want is an empty dictionary , define it as -
self.changes = {}