请大家看看这个怎么敲

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def year():
    n = input("请输入年月(空格分割)")
    a = n.split(" ")
    a1 = a[0]
    b = a[1]
    year = [29, 30, 31, 28]
    if int(a1) % 4 == 0 and int(a1) % 100 != 0 or int(a1) % 400 == 0:
        if int(b) in [1, 3, 5, 7, 8, 10, 12]:
            return year[2]
        elif int(b) in [4, 6, 9, 11]:
            return year[1]
        else:
            return year[0]
    else:
        if int(b) in [1, 3, 5, 7, 8, 10, 12]:
            return year[2]
        elif int(b) in [4, 6, 9, 11]:
            return year[1]
        else:
            return year[3]