mat数据格式是Matlab数据存储的标准格式，scipy可用于python.读取io中函数loadmat()的mat文件。

importscipy.ioasscio

path='ex3data1.mat'
data=scio.loadmat(path)
type(data)
dict#字典格式是data
data.keys()#查看字典键
dict_keys(['__header__','__version__','__globals__','X','y'])
X1=data['X']#选择所需的数据；数组格式
array([0.，0.，0.，0.，...,0.,0.,0.],
[0.，0.，0.，0.，0.，...,0.,0.,0.],
[0.，0.，0.，0.，0.，...,0.,0.,0.],
...,
[0.，0.，0.，0.，0.，...,0.,0.,0.],
[0.，0.，0.，0.，0.，...,0.,0.,0.],
[0.，0.，0.，0.，0.，...,0.,0.,0.]])

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