擅长:python、mysql、java
<p>你可以试试菲娜。你知道吗</p>
<pre><code>df=pd.DataFrame([["Alabama", "Auburn"],
[np.nan, "Florence"],
[np.nan, "Fairbanks"],
["Arizona", "Flagstaff"]], columns=["State", "RegionName"])
df
Out[94]:
State RegionName
0 Alabama Auburn
1 NaN Florence
2 NaN Fairbanks
3 Arizona Flagstaff
df.fillna(method='ffill')
Out[95]:
State RegionName
0 Alabama Auburn
1 Alabama Florence
2 Alabama Fairbanks
</code></pre>