Ввод
столбцов - [M23group, M23met_event, M23mode, M23validation_1min, M23validation_2min, M23voltage, M24AmbientAir_Av, M24Efficiency, M24FF, M24Impp, M24Impp 1005 * ']
cols = [w.replace('M23', 'M').replace('M24', 'M') for w in cols]
вывод столбцов - [' Mgroup ',' Mmet_event ',' Mmode ',' Mvalidation_1min ',' Mvalidation_2min ',' Mvoltage ',' MAmbientAir_Av ',' MEfficiency ',' MFF ',' MImpp ',' MIs c ']