初学Python-day7 案例（乘法口诀 已更新！！）
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):
for k in range(0, 9 - i):
print(' ', end='')
for j in range(i, 0, -1):
print('{} * {} ='.format(j, i), j*i, end=' ')
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
1 # 第四种
2 for i in range(1, 10):
3 for k in range(0, 9 - i):
4 print(' ', end='')
5 for j in range(i, 0, -1):
6 print('{} * {} ='.format(j, i), j*i, end=' ')
7 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
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 k = 1
5 while k < 10 - i:
6 print(' ', end=' ')
7 k += 1
8 j = i
9 while j > 0:
10 print('{} * {} ='.format(j, i), j*i, end=' ')
11 j -= 1
12 print()
13 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
#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
1 # 第四种
2 i = 9
3 while i > 0:
4 k = 1
5 while k < 10 - i:
6 print(' ', end=' ')
7 k += 1
8 j = i
9 while j > 0:
10 print('{} * {} ='.format(j, i), j*i, end=' ')
11 j -= 1
12 print()
13 i -= 1
运行结果：
注意：图形样式不太符合，会在更新。
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
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