我有這個列表列表：fall_2_gpa = [[4.0, 3.4175, 3.1675, 3.2475, 3.25, 3.2475, 3.3325, 3.585, 3.5825, 3.3325, 3.5, 3.585, 3.8325, 3.165, 3.5025, 3.835, 3.5, 3.4175, 3.6675, 3.165, 3.25, 3.4175, 3.9175, 3.6675, 3.8325, 3.2475, 3.4175, 3.4175, 3.5825, 3.415, 3.5825, 3.585, 3.25, 3.4175, 3.6675, 3.3325, 3.5, 3.165, 3.3325, 3.6675, 3.6675], [3.5], [3.1675, 3.4175, 3.5, 3.6675, 2.5, 2.835, 3.585, 3.4175, 3.25, 3.4175, 3.1675, 3.75], [2.6675, 3.0], [3.0825, 3.665, 3.6675, 3.3325, 3.3325, 3.415], [3.3325, 3.415, 3.415, 3.415, 3.75, 3.75, 3.665, 3.6675, 3.6675, 3.5825, 3.5825, 3.9175, 3.4175, 3.6675, 3.5, 3.5825, 3.585, 3.6675, 3.665, 3.4175, 3.585, 3.4175, 3.415, 3.75, 4.0, 3.5, 3.6675, 3.25, 3.585, 3.3325, 3.4175, 3.5, 3.6675, 3.7525, 3.3325, 3.835, 3.335, 3.665, 3.5, 3.6675, 3.585, 3.75, 3.75, 3.5, 3.415, 3.0825, 3.6675, 3.2475, 3.2475, 3.335, 3.9175, 3.75, 3.75, 3.75, 3.585, 3.585, 3.4175, 3.25, 3.3325, 3.5, 3.25, 3.75, 2.835, 3.1675, 2.5825, 3.25, 3.5825, 2.915, 2.8325, 2.5, 3.0825, 3.3325, 2.8325, 3.25, 2.8325, 3.335], [3.5, 3.3325, 3.6675], [3.165, 3.4175, 3.4975, 3.25], [3.5825, 3.5, 3.4175, 3.75, 3.335, 3.335, 3.415, 3.5, 3.6675, 3.165, 3.6675, 3.4975, 3.9175, 3.6675, 3.4175, 3.25, 3.3325, 3.585, 3.835, 3.2475, 3.335, 3.75, 3.5825, 3.5, 3.4175, 3.5, 3.75, 3.5825, 3.585, 3.335, 3.5825, 3.5825, 3.3325, 3.75, 3.5, 3.6675, 3.3325, 3.5825, 3.4175, 3.415, 3.585, 3.75, 3.415, 3.4175, 3.25, 3.4175, 3.415, 3.415, 3.75, 3.9175, 3.8325, 3mean_fall_2 = [statistics.mean(d) for d in fall_2_gpa if d != 0] stdev_fall_2 = [statistics.stdev(d) for d in fall_2_gpa if d != 0]但我不斷收到此錯誤：statistics.StatisticsError：方差至少需要兩個數(shù)據(jù)點我相信我得到這個是因為一些子列表只有 1 個值并且不超過 2 個。對于另一個列表我得到這個錯誤：statistics.StatisticsError: mean 至少需要一個數(shù)據(jù)點這可能意味著它找到了一個空的子列表？有辦法解決這些問題嗎？我需要 st.dev 并且意味著要計算所有內(nèi)容，無一例外。