外层循环控制行数，内层循环控制输出内容
1）while循环实现乘法表
1 j = 1 2 while j < 10: 3 i = 1 4 while i <= j: 5 # print("{} * {} = {:{}}".format(i,j,i*j,2),end=" ") 6 print(f"{j}* {i} = {j*i:>2}",end=" ") 7 8 i += 1 9 print() 10 j += 1
输出结果==》
1 * 1 = 1
1 * 2 = 2 2 * 2 = 4
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
2）for循环实现乘法表
1 for i in range(1,10): 2 for j in range(1,i+1): 3 print("{} * {} = {:>2}".format(j,i,j*i),end=" ") 4 print()
输出结果==》
1 * 1 = 1 1 * 2 = 2 2 * 2 = 4 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36 1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49 1 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64 1 * 9 = 9 2 * 9 = 18 3 * 9 = 27 4 * 9 = 36 5 * 9 = 45 6 * 9 = 54 7 * 9 = 63 8 * 9 = 72 9 * 9 = 81
1 for i in range(1,10): 2 for j in range(1,i+1): 3 # print("{} * {} = {:>2}".format(j,i,j*i),end=" ") 4 print(f"{j}* {i} = {j*i:>2}",end=" ") 5 print()
1* 1 = 1 1* 2 = 2 2* 2 = 4 1* 3 = 3 2* 3 = 6 3* 3 = 9 1* 4 = 4 2* 4 = 8 3* 4 = 12 4* 4 = 16 1* 5 = 5 2* 5 = 10 3* 5 = 15 4* 5 = 20 5* 5 = 25 1* 6 = 6 2* 6 = 12 3* 6 = 18 4* 6 = 24 5* 6 = 30 6* 6 = 36 1* 7 = 7 2* 7 = 14 3* 7 = 21 4* 7 = 28 5* 7 = 35 6* 7 = 42 7* 7 = 49 1* 8 = 8 2* 8 = 16 3* 8 = 24 4* 8 = 32 5* 8 = 40 6* 8 = 48 7* 8 = 56 8* 8 = 64 1* 9 = 9 2* 9 = 18 3* 9 = 27 4* 9 = 36 5* 9 = 45 6* 9 = 54 7* 9 = 63 8* 9 = 72 9* 9 = 81