python list改变维度_如何输出python中list的维度

python中输出list的维度可以使用numpy来实现：import numpy as np

a = [[1,2],[3,4]]

print(np.array(a).shape)

扩展：

reshape&resize&shape改变数组维度

reshape函数：不改变原数组维度，有返回值

resize函数：直接改变原数组维度，无返回值

shape属性：直接改变原数组维度>>> import numpy as np

>>> a=np.arange(12)

>>> a

array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])

>>> a.reshape(2,6)

array([[ 0, 1, 2, 3, 4, 5],

[ 6, 7, 8, 9, 10, 11]])

>>> a

array([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11])

>>> a.reshape(2,3,2)

array([[[ 0, 1],

[ 2, 3],

[ 4, 5]],

[[ 6, 7],

[ 8, 9],

[10, 11]]])

>>> a.resize(2,6)

>>> a

>>> array([[ 0, 1, 2, 3, 4, 5],

[ 6, 7, 8, 9, 10, 11]])

>>> a.shape=(2,6)

>>> a

array([[ 0, 1, 2, 3, 4, 5],

[ 6, 7, 8, 9, 10, 11]])

>>> a.shape=(2,3,2)

>>> a

array([[[ 0, 1],

[ 2, 3],

[ 4, 5]],

[[ 6, 7],

[ 8, 9],

[10, 11]]])

>>>

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