[Tkinter] tkiinter combobox selection problem

[Rishav]

so i am working on converter app so there is two comboboxes so there is meter is default value in combbox1 and kilometer value in combobox 2 and i have used ComboboxSelected event and check the condition if it match the condition then call the function. but problem is that as kilometer is default value. when i put value and press enter it doesn't work because i have not selected kilometer myself. so is there a solution that it will work without selceting default value again from combobox.