python判断列表维度_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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