How to handle input data from a WPF window?

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But this doesn’t solve the problem of having the business logic inside the class at all :sweat_smile:

@REDO_79 creating classes in python is just a step above the basic programming tutorials, I suggest you spend some time to learn about classes and OOP (Object Oriented Programming).
Here I define a class that can hold the data you need to pass to the logic

class TankData:
    def __init__(self, a, b, h, ep, contrainte):
        self.a = a
        self.b = b
        self.h = h
        self.ep = ep
        self.contrainte = contrainte

that you can use in the form like that

class TankInputForm(Window):
    def __init__(self):
        self.data = None
        # rest of the init method...

    def ok_button(self, sender, e):
        # calcualte A, B, H, ep and contrainte... then:
        self.data = TankData(A, B, H, ep, contrainte)
        self.close()

in the main script (i prefer to use a main function and just call main() as the last line of my script so I can exit early):

def main():
    tank_form = TankInputForm()
    if not tank_form.data:
        return
    # call the logic that does the transactions and reads the data from tank_form.data

Note that you can do the same without the data class and using a dictionary:
self.data = {"a": A, "b": B, ...}

The key point here is when you Close() a window, the instance is still in memory and you can access any of its attributes/properties to read the data it contains.

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