Pandas 向数据帧添加一行总计

我有一个数据框，我正试图找出如何向每个客户机添加一行，以汇总每个客户机的小时数。以下是我的数据框示例：

                              hours
client           month

A               January       203.50
                February      227.75
                March         159.75
                April         203.25
                May           199.90

B               January        203.50
                February       227.75
                March         159.75
                April          203.25
                May            199.90

C               January       203.50
                February      227.75
                March          159.75
                April         203.25
                May           199.90

我想在每个客户机上添加一行，总结小时数。它看起来是这样的：

                           hours
client           month

A               January    203.50
                February   227.75
                March      159.75
                April      203.25
                May        199.90
                Total     1000.34

B               January    203.50
                February   227.75
                March      159.75
                April      203.25
                May       199.90
                Total     1000.34

C               January   203.50
                February   227.75
                March      159.75
                April      203.25
                May       199.90
                Total     1000.34

我已经厌倦了编写一个for循环，它遍历每个客户机，汇总小时数，然后将新行附加到每个客户机。我正在尝试的循环看起来像这样

在df中的小时数： df.append（pd.Series（vp.sum（），name='Total'

---

但是，这不起作用。任何帮助都将不胜感激！！

IIUC，您可以使用

concat

pd.concat([df,df.sum(level=0).assign(month='Total').set_index('month',append=True)]).sort_index()
Out[1754]: 
                  hours
client month           
A      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15
B      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15
C      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15

---

您可以

unstack

然后添加列

df.unstack().hours.assign(Total=lambda d: d.sum(1)).stack().to_frame('hours')

                  hours
client month           
A      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15
B      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15
C      April     203.25
       February  227.75
       January   203.50
       March     159.75
       May       199.90
       Total     994.15

---

保留原始行顺序的变体：

# get old order of months
months = pd.unique(df.index.get_level_values(1)).tolist()

# create total dataframe with to levels of index
totals = pd.DataFrame.from_dict({
    (client, 'Total'): {'hours': v}
    for client, v in df.hours.sum(level=0).items()
}, 'index')

# append and reindex
df.append(totals).sort_index().reindex(months + ['Total'], level=1)

                  hours
client month           
A      January   203.50
       February  227.75
       March     159.75
       April     203.25
       May       199.90
       Total     994.15
B      January   203.50
       February  227.75
       March     159.75
       April     203.25
       May       199.90
       Total     994.15
C      January   203.50
       February  227.75
       March     159.75
       April     203.25
       May       199.90
       Total     994.15

---

我把它放在for循环中了吗？我写了你所说的，它不是在每个客户机的末尾添加一个名为“Total”的行，而是在每个客户机的末尾添加所有总计行df@TimothyMcwilliams你看到排序索引了吗？@TimothyMcwilliams-Yw~快乐编码