擅长:python、mysql、java
<p>使用<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.select.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>m1 = df.country_1_runs == df.country_2_runs
m2 = df.country_1_runs > df.country_2_runs
df['winner'] = np.select([m1, m2], [3, 1], default=2)
</code></pre>