擅长:python、mysql、java
<h2>更新</h2>
<p>试试看</p>
<pre><code>df1 = pd.DataFrame(index=pd.date_range('2015-04-24', periods = 50)).assign(value=1)
df2 = pd.DataFrame(index=pd.date_range('2015-04-28', periods = 50)).assign(value=1)
df3 = pd.concat([df1,df2], keys=['A','B'])
df3 = df3.rename_axis(['user','date']).reset_index()
df3.groupby('user').apply(lambda x: x.resample('7D', on='date').sum())
</code></pre>
<p>输出:</p>
^{pr2}$