<p>像这样试试<code>data.set_index(keys="Time", inplace=True)</code>:</p>
<pre class="lang-py prettyprint-override"><code>import pandas as pd
from io import StringIO
data = pd.read_csv(StringIO("""
Time l1 l2 l3 l4 l5 l6
0 11:24:26 0.787261 0.943828 1.100903 0.835889 2.524946 2.252113
1 11:24:26.005000 0.787068 0.943638 1.100871 0.835882 2.531180 2.253063
2 11:24:26.010000 0.786951 0.943496 1.100779 0.835909 2.531573 2.253395
3 11:24:26.015000 0.786879 0.943553 1.100877 0.835877 2.533841 2.254906
4 11:24:26.020000 0.786682 0.943536 1.100651 0.835674 2.539893 2.257780"""), sep="\s+")
data.set_index(keys="Time", inplace=True)
print(data)
</code></pre>
<p>输出:</p>
<pre><code> l1 l2 l3 l4 l5 l6
Time
11:24:26 0.787261 0.943828 1.100903 0.835889 2.524946 2.252113
11:24:26.005000 0.787068 0.943638 1.100871 0.835882 2.531180 2.253063
11:24:26.010000 0.786951 0.943496 1.100779 0.835909 2.531573 2.253395
11:24:26.015000 0.786879 0.943553 1.100877 0.835877 2.533841 2.254906
11:24:26.020000 0.786682 0.943536 1.100651 0.835674 2.539893 2.257780
</code></pre>