讯享网

 <span id="Label3"><p><span style="font-family:‘宋体‘;">字典修改或者添加：</span></p><p>dict[‘key‘] = value</p><p><br /></p><p>程序二：</p><p>file1.txt<span style="font-family:‘宋体‘;">文件内容如下</span>:</p><p>alex|123|1</p><p>carrick|123|1</p><p>tony|123|1</p><p><span style="font-family:‘宋体‘;">从文件</span>file1.txt<span style="font-family:‘宋体‘;">中读出内容，写成</span>dic = {‘carrick‘: [‘123‘, ‘1‘], ‘tony‘: [‘123‘, ‘1‘], ‘alex‘:[‘123‘, ‘1‘]}</p><p><span style="font-family:‘宋体‘;">代码</span>:</p><p style="background:#FFFFFF;"><span style="font-size:12px;font-family:‘宋体‘;background:rgb(255,228,255);">f</span><span style="font-size:12px;font-family:‘宋体‘;"> = </span><span style="font-size:12px;font-family:‘宋体‘;color:#000080;">file</span><span style="font-size:12px;font-family:‘宋体‘;">(</span><strong><span style="font-size:12px;font-family:‘宋体‘;color:#008000;">‘file1.txt‘</span></strong><span style="font-size:12px;font-family:‘宋体‘;">,</span><strong><span style="font-size:12px;font-family:‘宋体‘;color:#008000;">‘r‘</span></strong><span style="font-size:12px;font-family:‘宋体‘;">)<br />l = <span style="background:#E4E4FF;">f</span>.readlines()</span></p><p style="background:#FFFFFF;"><span style="font-size:12px;font-family:‘宋体‘;background:rgb(228,228,255);">f</span><span style="font-size:12px;font-family:‘宋体‘;">.close()<br />dic = {}<br /></span><strong><span style="font-size:12px;font-family:‘宋体‘;color:#000080;">for </span></strong><span style="font-size:12px;font-family:‘宋体‘;">i </span><strong><span style="font-size:12px;font-family:‘宋体‘;color:#000080;">in </span></strong><span style="font-size:12px;font-family:‘宋体‘;">l:<br />&nbsp; li = i.strip().split(</span><strong><span style="font-size:12px;font-family:‘宋体‘;color:#008000;">‘|‘</span></strong><span style="font-size:12px;font-family:‘宋体‘;">)</span><span style="background-color:rgb(255,0,0);"><span style="font-size:12px;font-family:‘宋体‘;"><br />&nbsp; dic[<span style="font-size:12px;font-family:‘宋体‘;">li.pop(</span><span style="font-size:12px;font-family:‘宋体‘;color:#0000FF;">0</span><span style="font-size:12px;font-family:‘宋体‘;">)</span>] = li &nbsp;<span style="font-family:‘宋体‘;font-size:12px;background-color:rgb(255,0,0);">&nbsp;--&gt;红色部分还可以写为黄色部分</span></span></span></p><p style="background:#FFFFFF;"><span style="font-size:12px;font-family:‘宋体‘;background-color:rgb(255,255,0);">&nbsp;&nbsp;<span style="font-size:12px;font-family:‘宋体‘;">dic[li[</span><span style="font-size:12px;font-family:‘宋体‘;color:#0000FF;">0</span><span style="font-size:12px;font-family:‘宋体‘;">]] = li[</span><span style="font-size:12px;font-family:‘宋体‘;color:#0000FF;">1</span><span style="font-size:12px;font-family:‘宋体‘;">:]</span>&nbsp;&nbsp;&nbsp; <span style="font-size:12px;font-family:‘宋体‘;">---&gt;li[0]表示列表的第一个元素，li[1:]表示从列表的第二个元素开始到最后一个元素</span></span></p><p style="background:#FFFFFF;"><strong><span style="font-size:12px;font-family:‘宋体‘;color:#000080;">print </span></strong><span style="font-size:12px;font-family:‘宋体‘;">dic</span></p><p><br /></p><p>python笔记day3</p></span>