1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, ... 12, 12, 12, 12, 12, 12, 12, 12, 12], dtype=int32) ϕΫτϧԽ͞Εͨ ϓϩύςΟΞΫηε (df.index.month == 1) | (df.index.month == 3) array([ True, True, True, True, True, True, True, ... False, False, False, False, False, False], dtype=bool)