[Python] sum columns in dataframe with pandas

I have a dataframe df_F1

df_F1.info()

<class 'pandas.core.frame.DataFrame'>
Int64Index: 2 entries, 0 to 1
Data columns (total 7 columns):
class_energy 2 non-null object
ACT_TIME_AERATEUR_1_F1 2 non-null float64
ACT_TIME_AERATEUR_1_F3 2 non-null float64
dtypes: float64(6), object(1)
memory usage: 128.0+ bytes


df_F1.head()

class_energy ACT_TIME_AERATEUR_1_F1 ACT_TIME_AERATEUR_1_F3
low 5.875550 431
medium 856.666667 856


I try to create a dataframe Ratio which contain for each class_energy the value of energy of each ACT_TIME_AERATEUR_1_Fx divided by the sum of energy of all class_energy for each ACT_TIME_AERATEUR_1_Fx. For example:

ACT_TIME_AERATEUR_1_F1 ACT_TIME_AERATEUR_1_F3
low 5.875550/(5.875550 + 856.666667) 431/(431+856)
medium 856.666667/(5.875550+856.666667) 856/(431+856)​

Can you help me please to resolve it?

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