python定义函数如何判断年份是否为闰年_python

def Year():
    year = input('请输入一个年份：')
    year = int(year)  # 将年份转换成转换为整数，如果转换一个不符合格式的字符串将会报错，如int('abc')
    if year % 400 == 0:
        print('年份%d是闰年' % year)
    elif year % 4 == 0 and year % 100 != 0:
        print('年份%d是闰年' % year)
    else:
        print('年份%d不是闰年' % year)
 
Year()

def is_leap(year):
    year = int(year)
    if (year % 4 == 0) and (year % 100 != 0):
        return True
    elif year % 400 == 0:
        return True
    else:
        return False

while(True):
    year = input("请输入一个年份:")
    if year == 'exit':
        import sys
        sys.exit(0)
    print("%s是闰年吗? %s" % (year, is_leap(year)))