#实现一个判断用户输入的年份是否是闰年的程序
year = int(input("请输入一个年份:"))
if (year % 400 == 0) or (year % 4 == 0 and year % 100 != 0 ):
print('这是闰年')
else:
print('不是闰年')
#输出乘法表
for i in range(1,10):
for x in range(1,i+1):
print("%d * %d = %d\t" % (x, i, i * x), end="")
print(" ")
#有如下数字li = [1,2,3,4,5,6,7,8,8]能组成多少个互不相同且不重复的数字的两位数
li=[1,2,3,4,5,6,7,8,8]
li2=[]
li3=[]
for b in li:
for c in li:
if b != c:
d="%d%d" % (c,b)
li2.append(d)
for e in li2:
if e not in li3:
li3.append(e)
print (li3),
print(len(li3))
#列表nums=[2,7,11,15,1,8,7],请找到列表中任意两个元素相加能够等于9的元素集合,列[(2,7), (1,8)]
nums=[2,7,11,15,1,8,7]
lis=[]
for one in nums:
for two in nums:
if one + two ==9:
s=list((one,two))
s.sort()
f=tuple(s)
if f not in lis:
lis.append(f)
print(lis)