擅长:python、mysql、java
<p>可以使用<code>where</code>设置设置值的条件,最后一个参数是条件为<code>False</code>时的值:</p>
<pre><code>In [6]:
df['movement'] = np.where(df['openPrice'] < df['closePrice'], 1, -1 )
df
Out[6]:
id openPrice closePrice movement
0 1 10 13 1
1 2 20 15 -1
[2 rows x 4 columns]
</code></pre>