i have a daframe with à multiindex column with 1 short name and 1 long name
df = pd.DataFrame({('Code géographique', 'CODGEO'): {0: 1001},
('Région', 'REG'): {0: 84},
('Département', 'DEP'): {0: 1},
('Libellé géographique', 'LIBGEO'): {0: "L'Abergement-Clémenciat"},
('Population en 2020 (princ)', 'P20_POP'): {0: 806}})
i want to select columns based on short name but i want to keep the multiindex structure. how can i do
columns_to_keep = ['CODGEO', 'REG', 'DEP']