擅长:python、mysql、java
<p>另一种解决方案是找到<code>length</code>,然后<a href="http://pandas.pydata.org/pandas-docs/stable/indexing.html#boolean-indexing" rel="nofollow">^{<cd2>}</a>用长度<code>0</code>或<code>1</code>替换所有数据:</p>
<pre><code>print (df.applymap(len))
Name Name2 DateTime
0 0 0 16
1 0 0 16
2 0 0 16
3 5 6 16
df[df.applymap(len) < 2] = np.nan
print (df)
Name Name2 DateTime
0 NaN NaN 2016-06-10 05:22
1 NaN NaN 2016-06-10 05:23
2 NaN NaN 2016-06-10 14:25
3 Guest Guest1 2016-06-10 15:32
</code></pre>