擅长:python、mysql、java
<pre><code>#import pandas as pd
#from datetime import datetime
#to_datetime = lambda d: datetime.strptime(d, '%d/%m/%Y')
#df = pd.read_csv('d.csv', converters={'dateDay': to_datetime})
</code></pre>
<p>上面的部分只有当你从文件中读取时,否则它就是你所需要的.shift()</p>
<pre><code>a = df
b = df.shift()
df["Fun_Cum"] = (a.weight - b.weight) * ((a.dateDay - b.dateDay).dt.days ==1)
</code></pre>