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初学Python-day7 案例
案例：：（乘法口诀）
用for循环做乘法口诀：
1 # 第一种 2 for i in range(1, 10): 3 for j in range(1, i + 1): 4 print('{} * {} ='.format(j, i), j*i, end=' ') 5 print()
运行结果：
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 #第二种 2 for i in range(9, 0, -1): 3 for j in range(1, i + 1): 4 print('{} * {} ='.format(j, i), j*i, end=' ') 5 print()
运行结果：
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 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64 1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49 1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36 1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25 1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16 1 * 3 = 3 2 * 3 = 6 3 * 3 = 9 1 * 2 = 2 2 * 2 = 4 1 * 1 = 1
1 # 第三种 2 for i in range(9, 0, -1): 3 for j in range(i, 0, -1): 4 print('{} * {} ='.format(j, i), j*i, end=' ') 5 print()
运行结果：
9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9
8 * 8 = 64 7 * 8 = 56 6 * 8 = 48 5 * 8 = 40 4 * 8 = 32 3 * 8 = 24 2 * 8 = 16 1 * 8 = 8
7 * 7 = 49 6 * 7 = 42 5 * 7 = 35 4 * 7 = 28 3 * 7 = 21 2 * 7 = 14 1 * 7 = 7
6 * 6 = 36 5 * 6 = 30 4 * 6 = 24 3 * 6 = 18 2 * 6 = 12 1 * 6 = 6
5 * 5 = 25 4 * 5 = 20 3 * 5 = 15 2 * 5 = 10 1 * 5 = 5
4 * 4 = 16 3 * 4 = 12 2 * 4 = 8 1 * 4 = 4
3 * 3 = 9 2 * 3 = 6 1 * 3 = 3
2 * 2 = 4 1 * 2 = 2
1 * 1 = 1
Process finished with exit code 0
1 # 第四种 2 for i in range(1, 10): 3 for j in range(i, 0, -1): 4 print('{} * {} ='.format(j, i), j*i, end=' ') 5 print()
运行结果：
1 * 1 = 1
2 * 2 = 4 1 * 2 = 2
3 * 3 = 9 2 * 3 = 6 1 * 3 = 3
4 * 4 = 16 3 * 4 = 12 2 * 4 = 8 1 * 4 = 4
5 * 5 = 25 4 * 5 = 20 3 * 5 = 15 2 * 5 = 10 1 * 5 = 5
6 * 6 = 36 5 * 6 = 30 4 * 6 = 24 3 * 6 = 18 2 * 6 = 12 1 * 6 = 6
7 * 7 = 49 6 * 7 = 42 5 * 7 = 35 4 * 7 = 28 3 * 7 = 21 2 * 7 = 14 1 * 7 = 7
8 * 8 = 64 7 * 8 = 56 6 * 8 = 48 5 * 8 = 40 4 * 8 = 32 3 * 8 = 24 2 * 8 = 16 1 * 8 = 8
9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9
Process finished with exit code 0
用while循环做乘法口诀：
1 # 第一种 2 i = 1 3 while i < 10: 4 j = 1 5 while j < i + 1: 6 print('{} * {} ='.format(j, i), j*i, end=' ') 7 j += 1 8 print() 9 i += 1
运行结果：
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
Process finished with exit code 0
1 # 第二种 2 i = 1 3 while i < 10: 4 j = i 5 while j > 0: 6 print('{} * {} ='.format(j, i), j*i, end=' ') 7 j -= 1 8 print() 9 i += 1
运行结果：
1 * 1 = 1
2 * 2 = 4 1 * 2 = 2
3 * 3 = 9 2 * 3 = 6 1 * 3 = 3
4 * 4 = 16 3 * 4 = 12 2 * 4 = 8 1 * 4 = 4
5 * 5 = 25 4 * 5 = 20 3 * 5 = 15 2 * 5 = 10 1 * 5 = 5
6 * 6 = 36 5 * 6 = 30 4 * 6 = 24 3 * 6 = 18 2 * 6 = 12 1 * 6 = 6
7 * 7 = 49 6 * 7 = 42 5 * 7 = 35 4 * 7 = 28 3 * 7 = 21 2 * 7 = 14 1 * 7 = 7
8 * 8 = 64 7 * 8 = 56 6 * 8 = 48 5 * 8 = 40 4 * 8 = 32 3 * 8 = 24 2 * 8 = 16 1 * 8 = 8
9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9
Process finished with exit code 0
#第三种 i = 9 while i > 0: j = 1 while j < i + 1: print('{} * {} ='.format(j, i), j*i, end=' ') j += 1 print() i -= 1
运行结果：
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 * 8 = 8 2 * 8 = 16 3 * 8 = 24 4 * 8 = 32 5 * 8 = 40 6 * 8 = 48 7 * 8 = 56 8 * 8 = 64
1 * 7 = 7 2 * 7 = 14 3 * 7 = 21 4 * 7 = 28 5 * 7 = 35 6 * 7 = 42 7 * 7 = 49
1 * 6 = 6 2 * 6 = 12 3 * 6 = 18 4 * 6 = 24 5 * 6 = 30 6 * 6 = 36
1 * 5 = 5 2 * 5 = 10 3 * 5 = 15 4 * 5 = 20 5 * 5 = 25
1 * 4 = 4 2 * 4 = 8 3 * 4 = 12 4 * 4 = 16
1 * 3 = 3 2 * 3 = 6 3 * 3 = 9
1 * 2 = 2 2 * 2 = 4
1 * 1 = 1
Process finished with exit code 0
# 第四种 i = 9 while i > 0: j = i while j > 0: print('{} * {} ='.format(j, i), j*i, end=' ') j -= 1 print() i -= 1
运行结果：
9 * 9 = 81 8 * 9 = 72 7 * 9 = 63 6 * 9 = 54 5 * 9 = 45 4 * 9 = 36 3 * 9 = 27 2 * 9 = 18 1 * 9 = 9
8 * 8 = 64 7 * 8 = 56 6 * 8 = 48 5 * 8 = 40 4 * 8 = 32 3 * 8 = 24 2 * 8 = 16 1 * 8 = 8
7 * 7 = 49 6 * 7 = 42 5 * 7 = 35 4 * 7 = 28 3 * 7 = 21 2 * 7 = 14 1 * 7 = 7
6 * 6 = 36 5 * 6 = 30 4 * 6 = 24 3 * 6 = 18 2 * 6 = 12 1 * 6 = 6
5 * 5 = 25 4 * 5 = 20 3 * 5 = 15 2 * 5 = 10 1 * 5 = 5
4 * 4 = 16 3 * 4 = 12 2 * 4 = 8 1 * 4 = 4
3 * 3 = 9 2 * 3 = 6 1 * 3 = 3
2 * 2 = 4 1 * 2 = 2
1 * 1 = 1
Process finished with exit code 0
注意：图形样式不太符合，会在更新。
用循环做数字的三角形（接昨天的继续更新）
用for循环
1 #第一种 2 for i in range(1, 10): 3 for j in range(1, i + 1): 4 print(j, end=' ') 5 print()
运行结果：
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
Process finished with exit code 0
#第二种 for i in range(9, 0, -1): for j in range(1, i + 1): print(j, end=' ') print()
运行结果：
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
Process finished with exit code 0
1 #第三种 2 for i in range(9, 0, -1): 3 for j in range(i, 0, -1): 4 print(j, end=' ') 5 print()
运行结果：
9 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
7 6 5 4 3 2 1
6 5 4 3 2 1
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1
Process finished with exit code 0
1 #第四种 2 for i in range(1, 10): 3 for j in range(i, 0, -1): 4 print(j, end=' ') 5 print()
运行结果：
1
2 1
3 2 1
4 3 2 1
5 4 3 2 1
6 5 4 3 2 1
7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
Process finished with exit code 0
用while循环
#第一种 i = 1 while i < 10: j = 1 while j < i + 1: print(j, end=' ') j += 1 print() i += 1
运行结果：
1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
Process finished with exit code 0
1 #第二种 2 i = 1 3 while i < 10: 4 j = i 5 while j > 0: 6 print(j, end=' ') 7 j -= 1 8 print() 9 i += 1
运行结果：
1
2 1
3 2 1
4 3 2 1
5 4 3 2 1
6 5 4 3 2 1
7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
9 8 7 6 5 4 3 2 1
Process finished with exit code 0
1 #第三种 2 i = 9 3 while i > 0: 4 j = 1 5 while j < i + 1: 6 print(j, end=' ') 7 j += 1 8 print() 9 i -= 1
运行结果：
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1
Process finished with exit code 0
1 #第四种： 2 i = 9 3 while i > 0: 4 j = i 5 while j > 0: 6 print(j, end=' ') 7 j -= 1 8 print() 9 i -= 1
运行结果：
9 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
7 6 5 4 3 2 1
6 5 4 3 2 1
5 4 3 2 1
4 3 2 1
3 2 1
2 1
1
Process finished with exit code 0
出处：https://www.cnblogs.com/liu-blogs/p/15211114.html
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