数学模块 math

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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>
<h3 id="math">数学模块 math</h3>
<ul>
<li>模块名: math</li>
<li>注：<ul>
<li>linux下为内建模块</li>
<li>Mac OS下为标准库模块</li>
</ul>
</li>
</ul>
<h4 id="_1">数学模块用法：</h4>
<div class="codehilite"><pre>import math
# 或
from math import *
</pre></div>

<table>
<thead>
<tr>
<th>数据</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>math.e</td>
<td>自然对数的底e</td>
</tr>
<tr>
<td>math.pi</td>
<td>圆周率pi</td>
</tr>
</tbody>
</table>
<table>
<thead>
<tr>
<th>函数名</th>
<th>描述</th>
</tr>
</thead>
<tbody>
<tr>
<td>math.ceil(x)</td>
<td>对x向上取整，比如x=1.2，返回2</td>
</tr>
<tr>
<td>math.floor(x)</td>
<td>对x向下取整，比如x=1.2，返回1</td>
</tr>
<tr>
<td>math.sqrt(x)</td>
<td>返回x的平方根</td>
</tr>
<tr>
<td>math.factorial(x)</td>
<td>求x的阶乘</td>
</tr>
<tr>
<td>math.log(x[, base])</td>
<td>返回以base为底x的对数, 如果不给出base,则以自然对数e为底</td>
</tr>
<tr>
<td>math.log10(x)</td>
<td>求以10为底x的对数</td>
</tr>
<tr>
<td>math.pow(x, y)</td>
<td>返回 x**y (x的y次方)</td>
</tr>
<tr>
<td>math.fabs(x)</td>
<td>返回浮点数x的绝对值</td>
</tr>
<tr>
<td>角度和弧度degrees互换</td>
<td></td>
</tr>
<tr>
<td>math.degree(x)</td>
<td>将弧度x转换为角度</td>
</tr>
<tr>
<td>math.radians(x)</td>
<td>将角度x转换为弧度</td>
</tr>
<tr>
<td>三角函数</td>
<td></td>
</tr>
<tr>
<td>math.sin(x)</td>
<td>返回x的正弦(x为弧度)</td>
</tr>
<tr>
<td>math.cos(x)</td>
<td>返回x的余弦(x为弧度)</td>
</tr>
<tr>
<td>math.tan(x)</td>
<td>返回x的正切(x为弧度)</td>
</tr>
<tr>
<td>math.asin(x)</td>
<td>返回x的反正弦(返回值为为弧度)</td>
</tr>
<tr>
<td>math.acos(x)</td>
<td>返回x的反余弦(返回值为为弧度)</td>
</tr>
<tr>
<td>math.atan(x)</td>
<td>返回x的反正切(返回值为为弧度)</td>
</tr>
</tbody>
</table>
        </article>
      </div>
    </div>

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