擅长:python、mysql、java
<p>您可以使用Python的三元运算符和列表理解:</p>
<pre><code>>>> vals = [10000, 500, 200, 10290, 10290129, 3]
>>> vals = [1 if i > 500 else 0 for i in vals]
>>> vals
[1, 0, 0, 1, 1, 0]
</code></pre>
<p>或者使用numpy(总是一个好的选择):</p>
<pre><code>>>> import numpy as np
>>> vals = np.array([10000, 500, 200, 10290, 10290129, 3])
>>> vals = (vals > 500).astype(int)
>>> vals
array([1, 0, 0, 1, 1, 0])
</code></pre>
<p>一些时间安排:</p>
<pre><code>In [4]: vals = np.random.rand(10000)
In [6]: %timeit [1 if i >= 0.5 else 0 for i in vals]
1.26 ms ± 105 µs per loop (mean ± std. dev. of 7 runs, 1000 loops each)
In [7]: %timeit [int(i >= 0.5) for i in vals]
5.18 ms ± 61 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
In [8]: %timeit (vals >= 0.5).astype(int)
12.9 µs ± 308 ns per loop (mean ± std. dev. of 7 runs, 100000 loops each)
</code></pre>
<p>和往常一样,numpy获胜,然后是三进制,然后是int转换。你知道吗</p>