摘要：
year = int(input("Please input the year:"))if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0): print("这是闰年")else: print("这不是闰年") 阅读全文
摘要：
book = [1, 2, 3, 4, 5]count = 0for a in book: for b in book: if a != b: for c in book: if c != a and c != b: count += 1 print("第%d种：A借书%d，B借书%d，C借书%d" 阅读全文
摘要：
if __name__ == '__main__': Li = [0, 1] for a in Li: for b in Li: for c in Li: zhang = (b == 0) li = (c == 0) wang = (a+b == 0) if (zhang+li+wang == 2 阅读全文
