擅长:python、mysql、java
<pre><code>df = df.sort_values(['ReportDate'], ascending=[True]) #Ensure your ReportDate is datetime column
df = df[(df['ReportDate'] > startDate) & (df['date'] <= endDate)] #You can have startDate, endDate as variables at top of your code section
del df['ReportDate']
df = df.groupby(['ClientId'],as_index=False).sum()
df = df.sort_values(['ClientRevenue'], ascending=[False])
top5 = df.head(5) #Selecting the top 5 clients
</code></pre>