<p>我认为您需要将其分配到新列:</p>
<pre><code>flight_data_finalcopy['new'] = flight_data_finalcopy["DepDelay"] +
flight_data_finalcopy["ArrDelay"]
</code></pre>
<p>或使用<a href="http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.add.html" rel="nofollow noreferrer">^{<cd1>}</a>:</p>
^{pr2}$
<p>按注释编辑:</p>
<p>移除<code>sum_arrival_delay = flight_data_finalcopy["sumDepArr"]</code>,然后将<code>sum_arrival_delay</code>替换为<code>flight_data_finalcopy</code>:</p>
<p>样品:</p>
<pre><code>flight_data_finalcopy = pd.DataFrame({'DepDelay':[1,2,3],
'ArrDelay':[4,5,6],
'UniqueCarrier':[7,8,9],
'AirlineID':[1,3,5],
'Another_column':[4,8,9]})
print (flight_data_finalcopy)
AirlineID Another_column ArrDelay DepDelay UniqueCarrier
0 1 4 4 1 7
1 3 8 5 2 8
2 5 9 6 3 9
flight_data_finalcopy["sumDepArr"] = flight_data_finalcopy["DepDelay"] + flight_data_finalcopy["ArrDelay"]
sum_arrival_delay_filter = flight_data_finalcopy[["UniqueCarrier", "AirlineID", "DepDelay", "ArrDelay", "sumDepArr"]]
print (sum_arrival_delay_filter)
UniqueCarrier AirlineID DepDelay ArrDelay sumDepArr
0 7 1 1 4 5
1 8 3 2 5 7
2 9 5 3 6 9
</code></pre>