退货商品数表

df1 = df_return[df_return['Year']==2010]
df2 = df_return[df_return['Year']==2011]
temp1 = df2['Quantity'].groupby(df2['Month']).sum()
temp1 = pd.DataFrame(temp1).rename(columns={'Quantity':'2011'})
temp1['2010']=df1['Quantity'].groupby(df1['Month']).sum()
temp1 = temp1.reset_index()

退货金额表

df3 = df_return[df_return['Year']==2010]
df4 = df_return[df_return['Year']==2011]
temp2 = df4['Total'].groupby(df4['Month']).sum()
temp2 = pd.DataFrame(temp2).rename(columns={'Total':'2011'})
temp2['2010']=df3['Total'].groupby(df3['Month']).sum()
temp2 = temp2.reset_index()

temp1.head()