In this kata you should simply determine, whether a given year is a leap year or not. In case you don't know the rules, here they are:
* years divisible by 4 are leap years
* but years divisible by 100 are **not** leap years
* but years divisible by 400 are leap years
Additional Notes:
* Only valid years (positive integers) will be tested, so you don't have to validate them
Examples can be found in the test fixture.
def isLeapYear(year):
    if year % 400 == 0 or year % 4 ==0 and not year % 100 == 0:
      return True
    else:
      return False
def isLeapYear(year):
    if year % 400 == 0 or year % 4 ==0 and not year % 100 == 0:
      return True
    else:
      return False