4.7: Telling If a Number is Even or Odd

If the product of the board width and height is divided by two and has a remainder of 0 (the % modulus operator evaluates what the remainder is) then the number is even. Even numbers divided by two will always have a remainder of zero. Odd numbers divided by two will always have a remainder of one. This is a good trick to remember if you need your code to tell if a number is even or odd:

>>> isEven = someNumber % 2 == 0
>>> isOdd = someNumber % 2 != 0

In the above case, if the integer in someNumber was even, then isEven will be True. If it was odd, then isOdd will be True.