42]: %timeit add_them(arr, arr)
4.12 ms +- 182 us per loop (mean +- std. dev. of 7 runs, 100 loops each)

In [143]: %timeit np.add(arr, arr)
6.89 us +- 504 ns per loop (mean +- std. dev. of 7 runs, 100000 loops each)</code></pre>
<p>本章的后面，我会介绍使用Numba（<a href="https://link.jianshu.com?t=http%3A%2F%2Fnumba.pydata.org%2F">http://numba.pydata.org/</a>），创建快速Python ufuncs。</p>
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<div id="section-15.5" class="section level2">
<h2><span class="header-section-numbe