擅长:python、mysql、java
<p>我认为需要<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.concat.html" rel="nofollow noreferrer">^{<cd1>}</a>新的数据帧,列为<code>A</code>,那么<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.reindex.html" rel="nofollow noreferrer">^{<cd3>}</a>如果想要相同的列顺序,最后用<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.fillna.html" rel="nofollow noreferrer">^{<cd4>}</a>替换缺失的值:</p>
<pre><code>data = [8,9,4]
df_new = pd.DataFrame({'A':data})
df = (pd.concat([df, df_new], ignore_index=True)
.reindex(columns=df.columns)
.fillna(0, downcast='infer'))
print (df)
A 20150901 20150902
0 1 4 5
1 4 2 7
2 8 0 0
3 9 0 0
4 4 0 0
</code></pre>