擅长:python、mysql、java
<p>下面是一个带有<code>apply</code>和<a href="https://docs.scipy.org/doc/numpy/reference/generated/numpy.reshape.html" rel="nofollow noreferrer">^{<cd2>}</a>的:</p>
<pre><code>f = lambda x: pd.DataFrame(np.reshape(x.to_numpy(),(-1,3))).add_prefix('Col_')
df.groupby('ID').apply(f).reset_index('ID')
</code></pre>
<hr/>
<pre><code> ID Col_0 Col_1 Col_2
0 1 A B C
1 1 A B C
2 1 A B C
3 2 D E F
4 2 D E F
5 2 D E F
</code></pre>