作业需求：
（1）运行程序输出第一级菜单
（2）选择一级菜单某项，输出二级菜单，同理输出三级菜单
（3）让用户选择是否要退出
（4）有返回上一级菜单的功能
<span style="color: #008080"> 1</span> data =<span style="color: #000000"> {
</span><span style="color: #008080"> 2</span> <span style="color: #800000">"</span><span style="color: #800000">天津</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 3</span> <span style="color: #800000">"</span><span style="color: #800000">南开区</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 4</span> <span style="color: #800000">"</span><span style="color: #800000">南开大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 5</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 6</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 7</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 8</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 9</span> <span style="color: #800000">"</span><span style="color: #800000">科技大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 10</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 11</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 12</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 13</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 14</span> <span style="color: #800000">"</span><span style="color: #800000">理工大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 15</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 16</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 17</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 18</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 19</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 20</span> <span style="color: #800000">"</span><span style="color: #800000">武清区</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 21</span> <span style="color: #800000">"</span><span style="color: #800000">武清大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 22</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 23</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 24</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 25</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 26</span> <span style="color: #800000">"</span><span style="color: #800000">武清科技大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 27</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 28</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 29</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 30</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 31</span> <span style="color: #800000">"</span><span style="color: #800000">武清理工大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 32</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 33</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 34</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 35</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 36</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 37</span> <span style="color: #800000">"</span><span style="color: #800000">北辰区</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 38</span> <span style="color: #800000">"</span><span style="color: #800000">北辰大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 39</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 40</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 41</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 42</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 43</span> <span style="color: #800000">"</span><span style="color: #800000">北辰科技大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 44</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 45</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 46</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 47</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 48</span> <span style="color: #800000">"</span><span style="color: #800000">北辰理工大学</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 49</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 50</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 51</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">:{},
</span><span style="color: #008080"> 52</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 53</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 54</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 55</span> <span style="color: #800000">"</span><span style="color: #800000">河北</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080"> 56</span> <span style="color: #800000">"</span><span style="color: #800000">保定市</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 57</span> <span style="color: #800000">"</span><span style="color: #800000">保定大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 58</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 59</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 60</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 61</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 62</span> <span style="color: #800000">"</span><span style="color: #800000">保定科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 63</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 64</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 65</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 66</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 67</span> <span style="color: #800000">"</span><span style="color: #800000">保定理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 68</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 69</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 70</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 71</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 72</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 73</span> <span style="color: #800000">"</span><span style="color: #800000">秦皇岛</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 74</span> <span style="color: #800000">"</span><span style="color: #800000">秦皇岛大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 75</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 76</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 77</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 78</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 79</span> <span style="color: #800000">"</span><span style="color: #800000">秦皇岛科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 80</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 81</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 82</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 83</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 84</span> <span style="color: #800000">"</span><span style="color: #800000">秦皇岛理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 85</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 86</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 87</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 88</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 89</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 90</span> <span style="color: #800000">"</span><span style="color: #800000">石家庄</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 91</span> <span style="color: #800000">"</span><span style="color: #800000">石家庄大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 92</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 93</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 94</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 95</span> <span style="color: #000000"> },
</span><span style="color: #008080"> 96</span> <span style="color: #800000">"</span><span style="color: #800000">石家庄科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080"> 97</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 98</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080"> 99</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">100</span> <span style="color: #000000"> },
</span><span style="color: #008080">101</span> <span style="color: #800000">"</span><span style="color: #800000">石家庄理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">102</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">103</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">104</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">105</span> <span style="color: #000000"> },
</span><span style="color: #008080">106</span> <span style="color: #000000"> },
</span><span style="color: #008080">107</span> <span style="color: #000000"> },
</span><span style="color: #008080">108</span> <span style="color: #800000">"</span><span style="color: #800000">河南</span><span style="color: #800000">"</span><span style="color: #000000">:{
</span><span style="color: #008080">109</span> <span style="color: #800000">"</span><span style="color: #800000">郑州市</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">110</span> <span style="color: #800000">"</span><span style="color: #800000">郑州大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">111</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">112</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">113</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">114</span> <span style="color: #000000"> },
</span><span style="color: #008080">115</span> <span style="color: #800000">"</span><span style="color: #800000">郑州科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">116</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">117</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">118</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">119</span> <span style="color: #000000"> },
</span><span style="color: #008080">120</span> <span style="color: #800000">"</span><span style="color: #800000">郑州理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">121</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">122</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">123</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">124</span> <span style="color: #000000"> },
</span><span style="color: #008080">125</span> <span style="color: #000000"> },
</span><span style="color: #008080">126</span> <span style="color: #800000">"</span><span style="color: #800000">南阳市</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">127</span> <span style="color: #800000">"</span><span style="color: #800000">南阳大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">128</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">129</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">130</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">131</span> <span style="color: #000000"> },
</span><span style="color: #008080">132</span> <span style="color: #800000">"</span><span style="color: #800000">南阳科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">133</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">134</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">135</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">136</span> <span style="color: #000000"> },
</span><span style="color: #008080">137</span> <span style="color: #800000">"</span><span style="color: #800000">南阳理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">138</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">139</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">140</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">141</span> <span style="color: #000000"> },
</span><span style="color: #008080">142</span> <span style="color: #000000"> },
</span><span style="color: #008080">143</span> <span style="color: #800000">"</span><span style="color: #800000">登封市</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">144</span> <span style="color: #800000">"</span><span style="color: #800000">登封大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">145</span> <span style="color: #800000">"</span><span style="color: #800000">历史系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">146</span> <span style="color: #800000">"</span><span style="color: #800000">文学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">147</span> <span style="color: #800000">"</span><span style="color: #800000">英语系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">148</span> <span style="color: #000000"> },
</span><span style="color: #008080">149</span> <span style="color: #800000">"</span><span style="color: #800000">登封科技大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">150</span> <span style="color: #800000">"</span><span style="color: #800000">计算机系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">151</span> <span style="color: #800000">"</span><span style="color: #800000">机器系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">152</span> <span style="color: #800000">"</span><span style="color: #800000">软件系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">153</span> <span style="color: #000000"> },
</span><span style="color: #008080">154</span> <span style="color: #800000">"</span><span style="color: #800000">登封理工大学</span><span style="color: #800000">"</span><span style="color: #000000">: {
</span><span style="color: #008080">155</span> <span style="color: #800000">"</span><span style="color: #800000">数学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">156</span> <span style="color: #800000">"</span><span style="color: #800000">化学系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">157</span> <span style="color: #800000">"</span><span style="color: #800000">物理系</span><span style="color: #800000">"</span><span style="color: #000000">: {},
</span><span style="color: #008080">158</span> <span style="color: #000000"> },
</span><span style="color: #008080">159</span> <span style="color: #000000"> },
</span><span style="color: #008080">160</span> <span style="color: #000000"> },
</span><span style="color: #008080">161</span> <span style="color: #000000">}
</span><span style="color: #008080">162</span> <span style="color: #008000">#</span><span style="color: #008000">exit_flag = False</span>
<span style="color: #008080">163</span> <span style="color: #0000ff">while</span><span style="color: #000000"> True:
</span><span style="color: #008080">164</span> <span style="color: #0000ff">for</span> i <span style="color: #0000ff">in</span><span style="color: #000000"> data :
</span><span style="color: #008080">165</span> <span style="color: #0000ff">print</span><span style="color: #000000"> (i)
</span><span style="color: #008080">166</span> choice = input (<span style="color: #800000">"</span><span style="color: #800000">input:</span><span style="color: #800000">"</span><span style="color: #000000">)
</span><span style="color: #008080">167</span> <span style="color: #0000ff">if</span> choice <span style="color: #0000ff">in</span><span style="color: #000000"> data:
</span><span style="color: #008080">168</span> <span style="color: #0000ff">while</span><span style="color: #000000"> True:
</span><span style="color: #008080">169</span> <span style="color: #0000ff">for</span> i2 <span style="color: #0000ff">in</span><span style="color: #000000"> data[choice]:
</span><span style="color: #008080">170</span> <span style="color: #0000ff">print</span><span style="color: #000000"> (i2)
</span><span style="color: #008080">171</span> choice2 = input(<span style="color: #800000">"</span><span style="color: #800000">input2:</span><span style="color: #800000">"</span><span style="color: #000000">)
</span><span style="color: #008080">172</span> <span style="color: #0000ff">if</span> choice2 <span style="color: #0000ff">in</span><span style="color: #000000"> data[choice]:
</span><span style="color: #008080">173</span> <span style="color: #0000ff">while</span><span style="color: #000000"> True:
</span><span style="color: #008080">174</span> <span style="color: #0000ff">for</span> i3 <span style="color: #0000ff">in</span><span style="color: #000000"> data[choice][choice2]:
</span><span style="color: #008080">175</span> <span style="color: #0000ff">print</span><span style="color: #000000"> (i3)
</span><span style="color: #008080">176</span> choice3 = input(<span style="color: #800000">"</span><span style="color: #800000">input3:</span><span style="color: #800000">"</span><span style="color: #000000">)
</span><span style="color: #008080">177</span> <span style="color: #0000ff">if</span> choice3 <span style="color: #0000ff">in</span><span style="color: #000000"> data[choice][choice2]:
</span><span style="color: #008080">178</span> <span style="color: #0000ff">for</span> i4 <span style="color: #0000ff">in</span><span style="color: #000000"> data[choice][choice2][choice3]:
</span><span style="color: #008080">179</span> <span style="color: #0000ff">print</span><span style="color: #000000">(i4)
</span><span style="color: #008080">180</span> choice4 = input(<span style="color: #800000">"</span><span style="color: #800000">Press b to return to the previous level:</span><span style="color: #800000">"</span><span style="color: #000000">)
</span><span style="color: #008080">181</span> <span style="color: #0000ff">if</span> choice4 == <span style="color: #800000">"</span><span style="color: #800000">b</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">182</span> <span style="color: #0000ff">pass</span>
<span style="color: #008080">183</span> <span style="color: #0000ff">elif</span> choice4 == <span style="color: #800000">"</span><span style="color: #800000">q</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">184</span> <span style="color: #000000"> exit ()
</span><span style="color: #008080">185</span> <span style="color: #0000ff">if</span> choice3 == <span style="color: #800000">"</span><span style="color: #800000">b</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">186</span> <span style="color: #0000ff">break</span>
<span style="color: #008080">187</span> <span style="color: #0000ff">elif</span> choice3 == <span style="color: #800000">"</span><span style="color: #800000">q</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">188</span> <span style="color: #000000"> exit()
</span><span style="color: #008080">189</span> <span style="color: #0000ff">if</span> choice2 == <span style="color: #800000">"</span><span style="color: #800000">b</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">190</span> <span style="color: #0000ff">break</span>
<span style="color: #008080">191</span> <span style="color: #0000ff">elif</span> choice2 == <span style="color: #800000">"</span><span style="color: #800000">q</span><span style="color: #800000">"</span><span style="color: #000000">:
</span><span style="color: #008080">192</span> exit()
以上是Python自动化开发学习的第一周作业---三级菜单的详细内容。更多信息请关注PHP中文网其他相关文章！
声明
本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn
Linux中的维护模式：系统管理员指南Apr 26, 2025 am 12:20 AM维护模式在Linux系统管理中扮演关键角色，帮助进行系统修复、升级和配置变更。1.进入维护模式可以通过GRUB菜单选择或使用命令“sudosystemctlisolaterescue.target”。2.在维护模式下，可以执行文件系统修复和系统更新等操作。3.高级用法包括重置root密码等任务。4.常见错误如无法进入维护模式或挂载文件系统，可通过检查GRUB配置和使用fsck命令修复。
Linux中的维护模式：何时以及为什么使用它Apr 25, 2025 am 12:15 AM使用Linux维护模式的时机和原因：1)系统启动问题时，2)进行重大系统更新或升级时，3)执行文件系统维护时。维护模式提供安全、控制的环境，确保操作的安全性和效率，减少对用户的影响，并增强系统的安全性。
Linux：基本命令和操作Apr 24, 2025 am 12:20 AMLinux中不可或缺的命令包括：1.ls：列出目录内容；2.cd：改变工作目录；3.mkdir：创建新目录；4.rm：删除文件或目录；5.cp：复制文件或目录；6.mv：移动或重命名文件或目录。这些命令通过与内核交互执行操作，帮助用户高效管理文件和系统。
Linux操作：管理文件，目录和权限Apr 23, 2025 am 12:19 AM在Linux中，文件和目录管理使用ls、cd、mkdir、rm、cp、mv命令，权限管理使用chmod、chown、chgrp命令。1.文件和目录管理命令如ls-l列出详细信息，mkdir-p递归创建目录。2.权限管理命令如chmod755file设置文件权限，chownuserfile改变文件所有者，chgrpgroupfile改变文件所属组。这些命令基于文件系统结构和用户、组系统，通过系统调用和元数据实现操作和控制。
Linux中的维护模式是什么？解释了Apr 22, 2025 am 12:06 AMMaintenancemodeInuxisAspecialBootenvironmentforforcalsystemmaintenancetasks.itallowsadMinistratorStoperFormTaskSlikerSettingPassingPassingPasswords，RepairingFilesystems，andRecoveringFrombootFailuresFailuresFailuresInamInimAlenimalenimalenrenmentrent.ToEnterMainterMainterMaintErmaintErmaintEncemememodeBoode，Interlecttheboo
Linux：深入研究其基本部分Apr 21, 2025 am 12:03 AMLinux的核心组件包括内核、文件系统、Shell、用户空间与内核空间、设备驱动程序以及性能优化和最佳实践。1)内核是系统的核心，管理硬件、内存和进程。2)文件系统组织数据，支持多种类型如ext4、Btrfs和XFS。3)Shell是用户与系统交互的命令中心，支持脚本编写。4)用户空间与内核空间分离，确保系统稳定性。5)设备驱动程序连接硬件与操作系统。6)性能优化包括调整系统配置和遵循最佳实践。
Linux体系结构：揭示5个基本组件Apr 20, 2025 am 12:04 AMLinux系统的五个基本组件是：1.内核，2.系统库，3.系统实用程序，4.图形用户界面，5.应用程序。内核管理硬件资源，系统库提供预编译函数，系统实用程序用于系统管理，GUI提供可视化交互，应用程序利用这些组件实现功能。
Linux操作：利用维护模式Apr 19, 2025 am 12:08 AMLinux的维护模式可以通过GRUB菜单进入，具体步骤为：1)在GRUB菜单中选择内核并按'e'编辑，2)在'linux'行末添加'single'或'1'，3)按Ctrl X启动。维护模式提供了一个安全环境，适用于系统修复、重置密码和系统升级等任务。
热AI工具
Undresser.AI Undress
人工智能驱动的应用程序，用于创建逼真的裸体照片
AI Clothes Remover
用于从照片中去除衣服的在线人工智能工具。
Undress AI Tool
免费脱衣服图片
Clothoff.io
AI脱衣机
Video Face Swap
使用我们完全免费的人工智能换脸工具轻松在任何视频中换脸！
热门文章
刺客信条阴影：贝壳谜语解决方案
4 周前ByDDD
Windows 11 KB5054979中的新功能以及如何解决更新问题
3 周前ByDDD
在哪里可以找到原子中的起重机控制钥匙卡
4 周前ByDDD
<🎜>：死铁路 - 如何完成所有挑战
1 个月前ByDDD
如何修复KB5055523无法在Windows 11中安装？
2 周前ByDDD
热工具
记事本++7.3.1
好用且免费的代码编辑器
适用于 Eclipse 的 SAP NetWeaver 服务器适配器
将Eclipse与SAP NetWeaver应用服务器集成。
ZendStudio 13.5.1 Mac
功能强大的PHP集成开发环境
螳螂BT
Mantis是一个易于部署的基于Web的缺陷跟踪工具，用于帮助产品缺陷跟踪。它需要PHP、MySQL和一个Web服务器。请查看我们的演示和托管服务。
PhpStorm Mac 版本
最新（2018.2.1 ）专业的PHP集成开发工具
