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()
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