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<section id="numeric-and-mathematical-modules">
<span id="numeric"></span><h1>数字和数学模块<a class="headerlink" href="#numeric-and-mathematical-modules" title="永久链接至标题"></a></h1>
<p>本章介绍的模块提供与数字和数学相关的函数和数据类型。 <a class="reference internal" href="numbers.html#module-numbers" title="numbers: Numeric abstract base classes (Complex, Real, Integral, etc.)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">numbers</span></code></a> 模块定义了数字类型的抽象层次结构。 <a class="reference internal" href="math.html#module-math" title="math: Mathematical functions (sin() etc.)."><code class="xref py py-mod docutils literal notranslate"><span class="pre">math</span></code></a> 和 <a class="reference internal" href="cmath.html#module-cmath" title="cmath: Mathematical functions for complex numbers."><code class="xref py py-mod docutils literal notranslate"><span class="pre">cmath</span></code></a> 模块包含浮点数和复数的各种数学函数。 <a class="reference internal" href="decimal.html#module-decimal" title="decimal: Implementation of the General Decimal Arithmetic Specification."><code class="xref py py-mod docutils literal notranslate"><span class="pre">decimal</span></code></a> 模块支持使用任意精度算术的十进制数的精确表示。</p>
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<li class="toctree-l1"><a class="reference internal" href="numbers.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">numbers</span></code> --- 数字的抽象基类</a><ul>
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<li class="toctree-l3"><a class="reference internal" href="numbers.html#adding-more-numeric-abcs">加入更多数字的ABC</a></li>
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<li class="toctree-l2"><a class="reference internal" href="math.html#power-and-logarithmic-functions">幂函数与对数函数</a></li>
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<li class="toctree-l1"><a class="reference internal" href="cmath.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">cmath</span></code> --- 关于复数的数学函数</a><ul>
<li class="toctree-l2"><a class="reference internal" href="cmath.html#conversions-to-and-from-polar-coordinates">到极坐标和从极坐标的转换</a></li>
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<li class="toctree-l1"><a class="reference internal" href="decimal.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">decimal</span></code> --- 十进制定点和浮点运算</a><ul>
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<li class="toctree-l1"><a class="reference internal" href="fractions.html"><code class="xref py py-mod docutils literal notranslate"><span class="pre">fractions</span></code> --- 分数</a></li>
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