一种方法是使用.apply():
In [83]: df
Out[83]:
Name Color
0 Apple NaN
1 Pear Green
2 Pear Green
3 Banana Yellow
4 Watermelon Green
In [84]: df['Color'] = df.apply(lambda x: 'Red' if x.Name == 'Apple' else x.Color, 1)
In [85]: df
Out[85]:
Name Color
0 Apple Red
1 Pear Green
2 Pear Green
3 Banana Yellow
4 Watermelon Green
另一种更简单的方法是使用.ix:
In [94]: df
Out[94]:
Name Color
0 Apple NaN
1 Pear Green
2 Pear Green
3 Banana Yellow
4 Watermelon Green
In [95]: df.ix[df.Name == 'Apple', 'Color'] = 'Red'
In [96]: df
Out[96]:
Name Color
0 Apple Red
1 Pear Green
2 Pear Green
3 Banana Yellow
4 Watermelon Green
对于提供样品的情况下,你可以这样做:'df.loc [ df ['Name'] =='Apple','Color'] ='Red'' –