Pandas GroupBy Total Row for Days of the week，然后只对一列求和

Question

I attempted this by:

df = {
'inc_date':['06-Jul-2020','06-Jul-2020','06-Jul-2020','07-Jul-2020','08-Jul-2020','08-Jul-2020','09-Jul-2020',],
}
df = pd.DataFrame(dict(df))
df['inc_Day_of_Week'] = pd.DatetimeIndex(df['inc_date']).day_name() # Create ddd of the INC
print(df)

dfTemp = df.groupby(['inc_Day_of_Week']).size()
dfTemp = dfTemp.reset_index(name='inc_volume').sort_index()
# Add sorting so days of week appear Mon-Fri
cats = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
dfTemp['inc_Day_of_Week'] = pd.Categorical(dfTemp['inc_Day_of_Week'], categories=cats, ordered=True)
dfTemp.loc['Total'] = dfTemp.sum(numeric_only=True)
display(dfTemp)
print("", end='\n')

    inc_Day_of_Week inc_volume
0   Monday          3.0
1   Thursday        1.0
2   Tuesday         1.0
3   Wednesday       2.0
Total   NaN         7.0

This is whats required except for the NaN ie How to remove the NaN only sum on the one column?

Total           7.0

I tried to append but this does fail:

dfTotal1 = [[dfTemp.inc_volume.sum()]]
dfTotal2 = pd.DataFrame(dfTotal1,columns=['inc_volume'])
dfTemp.append(dfTotal2)

Answer 1

Replacing NaN values with "" should solve your query. After you add the Total row to the dfTemp DataFrame, add this line of code

CODE

dfTemp.fillna(value="", inplace=True)

If you want to avoid calculating sum on categorical variables directly,

dfTotal = pd.DataFrame({"inc_Day_of_Week": "", "inc_volume": dfTemp.inc_volume.sum()}, index=["Total"])
dfTemp = pd.concat([dfTemp, dfTotal])

OUTPUT

          inc_Day_of_Week  inc_volume
0              Monday         3.0
1            Thursday         1.0
2             Tuesday         1.0
3           Wednesday         2.0
Total                         7.0

Answer 2

You can also try this,

import pandas as pd

df = {
'inc_date':['06-Jul-2020','06-Jul-2020','06-Jul-2020','07-Jul-2020','08-Jul-2020','08-Jul-2020','09-Jul-2020',],
}
df = pd.DataFrame(dict(df))
df['inc_Day_of_Week'] = pd.DatetimeIndex(df['inc_date']).day_name()
df = pd.DataFrame(df.groupby('inc_Day_of_Week').count()).reset_index()
df.loc['Total'] = df.sum(numeric_only=True)
df.fillna(value='',inplace=True)