numpy

ndarray.tolist()

a = np.array([1, 2])
a.tolist()
# [1, 2]

a = np.array([[1, 2], [3, 4]])
list(a)
# [array([1, 2]), array([3, 4])]
a.tolist()
# [[1, 2], [3, 4]]

平均值

np.mean([1, 2, 3])
# 2.0

np.average([1, 2, 3])
# 2.0

參考資料： 比較差異 - https://stackoverflow.com/questions/20054243/np-mean-vs-np-average-in-python-numpy