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    计算机二级python - 程序猿CubeTian
    
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				<h1 class="post-title itemprop="name headline">计算机二级python</h1>	
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					<time datetime="2019-08-11T14:06:14+08:00" pubdate data-updated="true">2019/08/11</time>
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		<a href='%E8%AE%A1%E7%AE%97%E6%9C%BA.html'>计算机</a>&nbsp;
		
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		<ul>
<li>注释 #</li>
<li>续行符 反斜杠 \</li>
<li>命名 大小字母、下划线、数字、汉字<br/>
但首字母不能是数字</li>
<li>保留字：<br/>
False, True, and, as, break, continue, def, del, elif, else, except, for, from, global, if, import, in, not, or, return, try, while (22个，2个大写)<br/>
None, finally, lambda, pass, with</li>
<li>jieba.lcut(s,cut_all=True)<br/>
*0x4DC0 是一个十六进制数，它对应的 Unicode 编码是中国古老的《易经》六十四卦的第一卦，请输出第 51 卦（震卦）对应的 Unicode 编码的二进制、十进制、八进制和十六进制格式。
<code>print(&quot;二进制{0:b}、十进制{0:d}、八进制{0:o}、十六进制{0:x}&quot;.format(0x4DC0+50))
</code></li>
<li>字符串的索引：<br/>
正向索引：最左侧字符序号为0，向右依次递增，最右侧为L-1<br/>
反向索引：最右侧字符序号为-1，向左依次递减，最左侧为-L</li>
<li>字符串的索引：<br/>
切片部分必须连续，[a=0,b=L-1,step=1] </li>
<li>文件操作
<code>
f = open(&#39;file.csv&#39;,&#39;r&#39;,encoding=&#39;GB2312&#39;)<br/>
ls = []<br/>
for line in f.readlines():<br/>
line.replace(&#39;\n&#39;,&#39;&#39;)<br/>
ls.append(line.split(&#39;,&#39;))
</code></li>
<li>字典操作<br/>
d[key] = d.get(key,0)</li>
</ul>

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