Python pandas：如何更改两个不同类别之间的分类值
Python pandas: how to change categorical values in between 2 different categories
大家好，我正在研究股票市场数据，我想知道如何更改 pandas 数据框，如下所示
From: Signal
To: Signal_new
Buy
Buy
Buy
Hold
Buy
Hold
Sell
Sell
Sell
Hold
Sell
Hold
Sell
Hold
Buy
Buy
提前致谢！
试试这个：
df[df['Signal'] == df['Signal'].shift(1)] = 'Hold'
输出：
>>> df
Signal
0 Buy
1 Hold
2 Hold
3 Sell
4 Hold
5 Hold
6 Hold
7 Buy
大家好，我正在研究股票市场数据，我想知道如何更改 pandas 数据框，如下所示
| From: Signal | To: Signal_new |
|---|---|
| Buy | Buy |
| Buy | Hold |
| Buy | Hold |
| Sell | Sell |
| Sell | Hold |
| Sell | Hold |
| Sell | Hold |
| Buy | Buy |
提前致谢！
试试这个：
df[df['Signal'] == df['Signal'].shift(1)] = 'Hold'
输出：
>>> df
Signal
0 Buy
1 Hold
2 Hold
3 Sell
4 Hold
5 Hold
6 Hold
7 Buy