Kivy size_hint (popup) decimal error

Question

I am fairly sure I have gone about screen-scaling incorrectly, but my approach is as follows:

I have a popup that displays information, whose height may change, dependant on the number of lines presented to the user. As I roughly know the height in pixels per line (due to knowing the font size), I have incremented i counting the \n's in the message being presented. I then divided this by the Window.height to give me a percentage of the screen required to properly display the information.

I know this information is displayed properly, when I hard code in the value resulted from the following equation;

    TwoDecPoints = Decimal(10) ** -2
    popupScale = (Decimal(i) / Decimal(Window.height)).quantize(TwoDecPoints)

But when I apply the popupScale (nn.nn) to the popup's size_hint;

    InformationScreen.ResultsPopup.size_hint = 0.95, popupScale

I receive this error;

    Popup.size_hint_y have an invalid format (got Decimal('0.25'))

This eludes me, because I have a 2 decimal number, 0.95 which it never complains about. I have attempted to use it as a string;

    InformationScreen.ResultsPopup.size_hint = 0.95, str(popupScale)

As well as using the original popupScale without quantize, and trimming the number;

    popupScale = (Decimal(i) / Decimal(Window.height))
    InformationScreen.ResultsPopup.size_hint = 0.95, str(popupScale)[:4]

Neither of which work.

I have looked around the documentation about size_hint, but could not find any relevant information to the data-type that size_hint requires. Any help would be greatly appreciated. Thanks

Answer 1

size_hint is a ReferenceListProperty, a tuple of size_hint_x and size_hint_y. size_hint_x (resp size_hint_y) is a NumericProperty it takes a float or an int. So float(popupScale) should do it.

Edit: if that didn't help the exact exception is raised in this line