[Python] How to get the output values ​of a apply

I have a function used by an application which returns two str. I want to assign the output values to two columns of a dataframe. But I don't understand how to assign to get the values, I get NaN values.

import pandas as pd
df = pd.DataFrame({
'nombre': [10, 25, 42, 18, 73]
}); df["COMMENT"] = df["S"] = None

def verif(row):
if row["nombre"] % 10 == 0: c = "Ends with 0"; e = "OK"
else: c = "Do not end with 0"; e = "KO"
return pd.Series({"e": e, "c": c})

mask = df["nombre"] % 2 == 0
df.loc[mask, ["S", "COMMENT"]] = df.loc[mask].apply(verif, axis=1)

Continue reading...