擅长:python、mysql、java
<p>将一列从数据帧复制到另一列非常容易:</p>
<pre><code>#existing dataframe
df = pd.DataFrame(columns=['A', 'B', 'C'])
#new dataframe
df2 = pd.DataFrame()
#copy data from existing to new
#let a new column for df2 be called X
df2['X'] = df['A']
</code></pre>