$$ For this assignment you will use python to write a GUI application to convert Miles per Gallon into Kilometers per Liter.

Your GUI should behave like most online conversion tools where the result is updated with each number the user types. The user should not need to click on a button to compute the final total. Your program should also not crash in the event of the user typing a letter or leaving a box blank.

For conversion: $1$ mpg $=0\mathrm{.}425143707$ km$/$l