擅长:python、mysql、java
<p>您还可以执行以下操作:</p>
<pre><code>def func(df, *l):
d = pd.DataFrame(df, columns=l)
d.rename(columns={'col1':'num', 'col2':'group'}, inplace=True)
return d
df2 = func(df, 'id','col1','col2')
print(df2)
id num group
0 1 a b
1 1 a b
2 1 c d
</code></pre>