Day_of_the_week_is_monday, Day_of_the_week_is_tuesday, ...

dataframe = pd.DataFrame({
                          'Result' : np.array([1,2,2,10,100],dtype='int32'),
                          'Day_of_the_week' : pd.Categorical(["Monday","Tuesday","Wednesday","Thursday","Friday"]),})

dataframe_dummies = pd.get_dummies(dataframe, prefix=['Day_of_the_week_is'])

### get subset dataframe

dataframe_subset = pd.DataFrame({
                          'Result' : np.array([1,2,2,10],dtype='int32'),
                          'Day_of_the_week' : pd.Categorical(["Thursday","Thursday","Thursday","Saturday"]),})

dataframe_subset_dummies = pd.get_dummies(dataframe_subset, prefix=['Day_of_the_week_is'])

Result  Is_Friday  Is_Monday  Is_Thursday  Is_Tuesday  Is_Wednesday
0       1          0          1            0           0             0
1       2          0          0            0           1             0
2       2          0          0            0           0             1
3      10          0          0            1           0             0
4     100          1          0            0           0             0

Result  Day_is_Saturday  Day_is_Thursday
0       1                0                1
1       2                0                1
2       2                0                1
3      10                1                0