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[Django]calculate value in model
Hi I am new to Django

I have a Model with Buying and Selling Rate and have loaded data it.

Now i want to update the Model and a calculative column called Profit like:


It throws error.

What is the correct way to do it, how can i change value for the data which have been loaded earlier from python.

i know we have to do something in default=calculated_value

Kindly help.



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