How to call a previous MACD difference value?

I'm pretty new to coding and I am trying to write my own MACD difference value in python (because I couldn't find one in the git repository).

I'm using the sample MACD code which can be found here

I am trying to create a MACD Difference which takes the difference between MACD and its moving average and a MACD Previous Difference which takes the previous value of the MACD difference after the hour has closed. However, I don't know how to do MACD previous in terms of objects and attributes. Here is what I have so far:

# define MACD Difference and Previous Difference
Diff = (self.__macd.Current.Value - self.__macd.MovingAverageType.Current.Value)
Diffprev = self.__macd.


I'm fairly new to coding so I'm not sure what to do from here whether that means create an attribute for what I need or if there is already one in the repository.
Thanks for your help.

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