擅长:python、mysql、java
<p>以下是满足您要求的代码-</p>
<pre><code>import pandas as pd
df = [[10,100,99],[20,280,300],[30,680,700] ]
df = pd.DataFrame(df, columns = ['strike_price', 'ask','bid'])
df = df.set_index('strike_price')
df=df.assign(Derive=df.bid.sub(df.ask.shift(1)))
df['Derive'][10]=""
print(df)
</code></pre>
<p>这是这段代码的输出-</p>
^{pr2}$