def _IsLeapYear(self, year):
<EOL>return (year % <NUM_LIT:4> == <NUM_LIT:0> and year % <NUM_LIT:100> != <NUM_LIT:0>) or year % <NUM_LIT> == <NUM_LIT:0><EOL>
Determines if a year is a leap year.

        Args:
          year (int): year e.g. 1970.

        Returns:
          bool: True if the year is a leap year.