擅长:python、mysql、java
<p>使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Series.where.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
<pre><code>df['col1']=( df.col1.str.split()
.apply(lambda x: ', '.join(x[::-1]).rstrip(','))
.where(df['col1'].str.contains(','),df['col1']) )
</code></pre>
<hr/>
<pre><code> ID col1
0 1 Michael Owen
1 2 Stephen Curry
2 3 Lionel, Messi
3 4 LeBron, James
</code></pre>
<hr/>
<p>如果你想放下<code>','</code></p>
<pre><code>df['col1']=( df.col1.str.split()
.apply(lambda x: ', '.join(x[::-1]).rstrip(','))
.where(df['col1'].str.contains(','),df['col1'])
.str.replace(',','') )
</code></pre>
<hr/>
<pre><code> ID col1
0 1 Michael Owen
1 2 Stephen Curry
2 3 Lionel Messi
3 4 LeBron James
</code></pre>