博客

>>> a = []

>>> b = [1,2,3]

>>> c = [4,5,6]

>>> a.append(b)

>>> a.append(c)

>>> a

[[1, 2, 3], [4, 5, 6]]

>>> type(a)

<class ‘list’>

>>> import numpy

>>> mean = numpy.mean(a, axis=0)

>>> mean

array([2.5, 3.5, 4.5])

>>> type(mean)

<class ‘numpy.ndarray’>

>>>

用numpy函数对list类型操作，会自动把list转化为array类型。