《云计算全栈》-python篇：python实现九九乘法表代码详解

2 案例2：九九乘法表
2.1 问题

创建mtable.py脚本，要求如下：

程序运行后，可以在屏幕上打印出九九乘法表
修改程序，由用户输入数字，可打印任意数字的乘法表

     
     
     
     
      
      1
      
      2

2.2 方案

本题主要用for循环双层嵌套方式编写脚本，需要注意的是：

1.外层for循环用内置函数range，将1~9范围内的每个数字，依次装入自定义变量i中，此时，变量i被循环赋值9次

2.内层for循环将1~变量i范围内的每个数字，依次装入变量j中，此时变量j被循环赋值i次，此时外层for循环每循环一次，内层for循环i次

3.内层for循环range取值节点应是外层变量i加1，这样内层变量j可以取到i的值

4.程序最后print()相当于回车，每完成一次外部循环，执行回车，作用在于美化执行结果
2.3 步骤

实现此案例需要按照如下步骤进行。

步骤一：编写脚本

    [root@localhost day03]# vim mtable.py
    #!/usr/bin/env python3
    for i in range(1, 10):            # [0, 1, 2]
        for j in range(1, i+1):         # i->0:[0], i->1: [0, 1], i->2: [0, 1, 2]
            print('%sX%s=%s' % (j, i, i*j), end=' ')
        print()
    [root@localhost day03]# vim mtable.py
    #!/usr/bin/env python3
    i=1
    while i<=9:
        j=1
        while j<=i:
            print("%d*%d=%d" % (j,i,j*i),end=" ")
            j+=1
        print("")
        i+=1

     
     
     
     
      
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步骤二：测试脚本执行
<span class="token punctuation">[</span>root@localhost day03<span class="token punctuation">]</span><span class="token comment"># python3 mtable.py</span>
1X1<span class="token operator">=</span><span class="token number">1</span> 
1X2<span class="token operator">=</span><span class="token number">2</span> 2X2<span class="token operator">=</span><span class="token number">4</span> 
1X3<span class="token operator">=</span><span class="token number">3</span> 2X3<span class="token operator">=</span><span class="token number">6</span> 3X3<span class="token operator">=</span><span class="token number">9</span> 
1X4<span class="token operator">=</span><span class="token number">4</span> 2X4<span class="token operator">=</span><span class="token number">8</span> 3X4<span class="token operator">=</span><span class="token number">12</span> 4X4<span class="token operator">=</span><span class="token number">16</span> 
1X5<span class="token operator">=</span><span class="token number">5</span> 2X5<span class="token operator">=</span><span class="token number">10</span> 3X5<span class="token operator">=</span><span class="token number">15</span> 4X5<span class="token operator">=</span><span class="token number">20</span> 5X5<span class="token operator">=</span><span class="token number">25</span> 
1X6<span class="token operator">=</span><span class="token number">6</span> 2X6<span class="token operator">=</span><span class="token number">12</span> 3X6<span class="token operator">=</span><span class="token number">18</span> 4X6<span class="token operator">=</span><span class="token number">24</span> 5X6<span class="token operator">=</span><span class="token number">30</span> 6X6<span class="token operator">=</span><span class="token number">36</span> 
1X7<span class="token operator">=</span><span class="token number">7</span> 2X7<span class="token operator">=</span><span class="token number">14</span> 3X7<span class="token operator">=</span><span class="token number">21</span> 4X7<span class="token operator">=</span><span class="token number">28</span> 5X7<span class="token operator">=</span><span class="token number">35</span> 6X7<span class="token operator">=</span><span class="token number">42</span> 7X7<span class="token operator">=</span><span class="token number">49</span> 
1X8<span class="token operator">=</span><span class="token number">8</span> 2X8<span class="token operator">=</span><span class="token number">16</span> 3X8<span class="token operator">=</span><span class="token number">24</span> 4X8<span class="token operator">=</span><span class="token number">32</span> 5X8<span class="token operator">=</span><span class="token number">40</span> 6X8<span class="token operator">=</span><span class="token number">48</span> 7X8<span class="token operator">=</span><span class="token number">56</span> 8X8<span class="token operator">=</span><span class="token number">64</span> 
1X9<span class="token operator">=</span><span class="token number">9</span> 2X9<span class="token operator">=</span><span class="token number">18</span> 3X9<span class="token operator">=</span><span class="token number">27</span> 4X9<span class="token operator">=</span><span class="token number">36</span> 5X9<span class="token operator">=</span><span class="token number">45</span> 6X9<span class="token operator">=</span><span class="token number">54</span> 7X9<span class="token operator">=</span><span class="token number">63</span> 8X9<span class="token operator">=</span><span class="token number">72</span> 9X9<span class="token operator">=</span><span class="token number">81</span>

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