列表练习

1 nums=[2,7,11,15,1,8,7]
2 a=[]
3 for i in range(0,len(nums)):  # 获取nums的索引
4     for j in range(0,len(nums)):
5         if nums[i]+nums[j]==9:
6             a.append((i,j))
7 print(a)

nums=[2,7,11,15,1,8,7]
a=[]
for i in nums:
    for j in nums:
        if i+j==9:
            a.append((i,j))
print(a)

1 for i in range(1,10):
2     ss=‘‘
3     for j in range(1,i+1):
4         ss += str(j)+‘*‘+str(i)+‘=‘+str(i*j)+‘\t‘  #连接字符串，并不换行
5     print(ss)