[Qt-interest] How to set all button's background except one whose x()=100?

[Kermit Mei]

Hello,community!
I want to set all the buttons on a widget, but except the one whose x()
is always 100. How to write the .css syntax?

For example,
QPushButton[x=100] {border-image: url(:/images/key.png); }
but, now the x!=100.

I can't confirm the other buttons position at compile-time, they are
confirmed at run-time.

Any way,please?

Thanks.