Python3 中常用字符串方法(method)

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          <h3 id="python">《Python 教程》授课笔记附件</h3>
<ul>
<li>讲师: 魏明择</li>
<li>时间: 2019</li>
</ul>
<h2 id="python3-method">Python3 中常用字符串方法(method)</h2>
<h3 id="_1">字符串的方法调用语法:</h3>
<div class="codehilite"><pre>对象.方法名(方法传参)
</pre></div>

<h4 id="_2">字符串的属性用法示例:</h4>
<div class="codehilite"><pre>&quot;abc&quot;.isalpha()  # 语法是对的
123.isalpha()    # 语法是错的
</pre></div>

<p>如下假设字符串变量名为S</p>
<h3 id="_3">常用字符串方法</h3>
<table>
<thead>
<tr>
<th>方法</th>
<th>说明</th>
</tr>
</thead>
<tbody>
<tr>
<td>S.isdigit()</td>
<td>判断字符串中的字符是否全为数字</td>
</tr>
<tr>
<td>S.isalpha()</td>
<td>判断字符串是否全为英文字母</td>
</tr>
<tr>
<td>S.islower()</td>
<td>判断字符串所有字符是否全为小写英文字母</td>
</tr>
<tr>
<td>S.isupper()</td>
<td>判断字符串所有字符是否全为大写英文字母</td>
</tr>
<tr>
<td>S.isspace()</td>
<td>判断字符串是否全为空白字符</td>
</tr>
<tr>
<td>S.center(width[,fill])</td>
<td>将原字符串居中，左右默认填充空格</td>
</tr>
<tr>
<td>S.count(sub[, start[,end]])</td>
<td>获取一个字符串中子串的个数</td>
</tr>
<tr>
<td>S.find(sub[, start[,end]])</td>
<td>获取字符串中子串sub的索引,失败返回-1</td>
</tr>
<tr>
<td>S.strip([chars])</td>
<td>返回去掉左右char字符的字符串(默认char为空白字符)</td>
</tr>
<tr>
<td>S.lstrip([chars])</td>
<td>返回去掉左侧char字符的字符串(默认char为空白字符)</td>
</tr>
<tr>
<td>S.rstrip([chars])</td>
<td>返回去掉右侧char字符的字符串(默认char为空白字符)</td>
</tr>
<tr>
<td>S.upper()</td>
<td>生成将英文转换为大写的字符串</td>
</tr>
<tr>
<td>S.lower()</td>
<td>生成将英文转换为小写的字符串</td>
</tr>
<tr>
<td>S.replace(old, new[, count])</td>
<td>将原字符串的old用new代替，生成一个新的字符串</td>
</tr>
<tr>
<td>S.startswith(prefix[, start[, end]])</td>
<td>返回S是否是以prefix开头，如果以prefix开头返回True,否则返回False,</td>
</tr>
<tr>
<td>S.endswith(suffix[, start[, end]])</td>
<td>返回S是否是以suffix结尾，如果以suffix结尾返回True,否则返回False</td>
</tr>
<tr>
<td>以下是不常用的</td>
<td></td>
</tr>
<tr>
<td>S.title()</td>
<td>生成每个英文单词的首字母大写字符串</td>
</tr>
<tr>
<td>S.isnumeric()</td>
<td>判断字符串是否全为数字字符</td>
</tr>
</tbody>
</table>
<blockquote>
<p>空白字符</p>
<blockquote>
<p>是指空格,水平制表符(\t),换行符(\n)等不可见的字符</p>
</blockquote>
</blockquote>
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