擅长:python、mysql、java
<p>将<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.apply.html" rel="nofollow noreferrer">^{<cd1>}</a>与<code>max</code>一起使用:</p>
<pre><code>#if strings
#import ast
#print (type(df.loc[0, 'day']))
#<class 'str'>
#df['day'] = df['day'].apply(ast.literal_eval)
</code></pre>
<hr/>
^{pr2}$
<p>或列表理解:</p>
<pre><code>df['day'] = [max(x) for x in df['day']]
</code></pre>
<hr/>
<pre><code>print (df)
day plcae
0 5 A
1 4 B
2 2 C
3 4 D
</code></pre>