📅  最后修改于: 2022-03-11 14:59:20.689000             🧑  作者: Mango
if year % 4 == 0:
if year % 100 == 0:
if year % 400 == 0:
print("leap year")
else:
print("not a leap year")
else:
print("leap year")
else:
print("not a leap year")