擅长:python、mysql、java
<p>考虑到你的<code>df</code>是这样的:</p>
<pre><code>In [121]: df
Out[121]:
1 2 3 4
0
2020-12-04_163024 26.15 26.37 19.40 24.57
2020-12-04_163026 26.15 26.37 19.20 24.57
2020-12-04_163028 26.05 26.37 18.78 24.57
</code></pre>
<p>可以将<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.replace.html" rel="nofollow noreferrer">^{<cd2>}</a>与<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.dt.time.html" rel="nofollow noreferrer">^{<cd3>}</a>一起使用:</p>
<pre><code>In [122]: df.reset_index(inplace=True)
In [127]: df[0] = pd.to_datetime(df[0].str.replace('_', ' ')).dt.time
In [130]: df.set_index(0, inplace=True)
In [131]: df
Out[131]:
1 2 3 4
0
16:30:24 26.15 26.37 19.40 24.57
16:30:26 26.15 26.37 19.20 24.57
16:30:28 26.05 26.37 18.78 24.57
</code></pre>