Modified entry widget to interact properly with keyboard #7
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I have modified the Entry widget to be set to focus throughout the program right from the start. This is because the user won't have to click on the widget to write in it from the physical keyboard.
The user will only be able to input numbers and operators to the Entry widget from the physical keyboard. The operators include: "+", "-", "*" and "/". You can add more in the
checkIfNumberOrOperator
function.