擅长:python、mysql、java
<p>Use<code>.assign</code>返回一个新的数据帧</p>
<pre><code>In [137]: Table1 = FamilyVsWWTotal.assign(Region='K')
In [138]: Table1
Out[138]:
Country date Region
0 USA 2011-4-3 K
1 CAN 2011-3-5 K
2 USA 2011-4-3 K
3 MEX 2011-5-7 K
In [139]: Table2 = FamilyVsWWTotal.assign(aveAge=60)
In [140]: Table2
Out[140]:
Country date aveAge
0 USA 2011-4-3 60
1 CAN 2011-3-5 60
2 USA 2011-4-3 60
3 MEX 2011-5-7 60
In [141]: FamilyVsWWTotal
Out[141]:
Country date
0 USA 2011-4-3
1 CAN 2011-3-5
2 USA 2011-4-3
3 MEX 2011-5-7
</code></pre>
<p>或者,在<code>copy</code>上工作</p>
<pre><code>In [142]: Table1 = FamilyVsWWTotal.copy()
In [143]: Table1['Region'] = 'K'
In [144]: Table1
Out[144]:
Country date Region
0 USA 2011-4-3 K
1 CAN 2011-3-5 K
2 USA 2011-4-3 K
3 MEX 2011-5-7 K
In [145]: FamilyVsWWTotal
Out[145]:
Country date
0 USA 2011-4-3
1 CAN 2011-3-5
2 USA 2011-4-3
3 MEX 2011-5-7
</code></pre>