A year with 366 days is called a leap year. Leap years are necessary to keep the calendar synchronized with the sun because the earth revolves around the sun once every 365.25 days. Actually, that figure is not entirely precise, and for all dates after 1582 the Gregorian correction applies. Usually years that are divisible by 4 are leap years (for example, 1996). However, years that are divisible by 100 (for example, 1900) are not leap years, but years that are divisible by 400 are leap years (for example, 2000). Implement function leap() that takes one input argumenta yearand returns True if the year is a leap year and False otherwise. >>> leap(2008) True >>> leap(1900) False >>> leap(2000) True