How to save and load datas into a variable from another file

Question

I would like to create a programm in which I can record the total number of pull-ups I did.
So I can use it every day to add some other pull-ups but the programm must remember the total of the day before. Can you help me? Thanks

Answer 1

https://code.sololearn.com/cH6po02YOCCu/?ref=app

Answer 2

Look on the tutorials in this app.

Answer 3

how can access a variable in other class