擅长:python、mysql、java
<p>使用<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.html" rel="nofollow noreferrer">^{<cd1>}</a>和<a href="https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.append.html" rel="nofollow noreferrer">^{<cd2>}</a>:</p>
<pre><code>df = df.append(pd.DataFrame(xtra, columns=['col1']), ignore_index=True)
print(df)
col1 col2
0 1 3.0
1 2 4.0
2 3 NaN
3 4 NaN
</code></pre>