ValueError: Unknown mat file type, version 0, 0， KeyError: "Unable to open object (object 'data' doe
python3读取.mat文件：
代码：
from scipy import io
mat_file = r'/home/data/1.mat'
io.loadmat(mat_file)
报错：
Traceback (most recent call last):
File "/home/user1/test.py", line 78, in
show_mat(mat)
File "/home/user1/test.py", line 50, in show_mat_flow
x = io.loadmat(mat_file)
File "/home/user1/.local/lib/python3.6/site-packages/scipy/io/matlab/mio.py", line 207, in loadmat
MR, file_opened = mat_reader_factory(file_name, appendmat, **kwargs)
File "/home/user1/.local/lib/python3.6/site-packages/scipy/io/matlab/mio.py", line 63, in mat_reader_factory
mjv, mnv = get_matfile_version(byte_stream)
File "/home/user1/.local/lib/python3.6/site-packages/scipy/io/matlab/miobase.py", line 241, in get_matfile_version
raise ValueError('Unknown mat file type, version %s, %s' % ret)
ValueError: Unknown mat file type, version 0, 0
还有一种报错：
Traceback (most recent call last):
File "", line 1, in
File "/data/user1/pkgs/conda/envs/drc/lib/python3.7/site-packages/scipy/io/matlab/mio.py", line 217, in loadmat
MR, _ = mat_reader_factory(f, **kwargs)
File "/data/user1/pkgs/conda/envs/drc/lib/python3.7/site-packages/scipy/io/matlab/mio.py", line 72, in mat_reader_factory
mjv, mnv = get_matfile_version(byte_stream)
File "/data/user1/pkgs/conda/envs/drc/lib/python3.7/site-packages/scipy/io/matlab/miobase.py", line 235, in get_matfile_version
maj_ind = int(tst_str[2] == b'I'[0])
IndexError: index out of range
换一种方式打开.mat文件，还是报错：
代码：
x = h5py.File(mat_file, 'w')
data = x['data']
报错：
Traceback (most recent call last):
File "/home/user1/test.py", line 90, in
show_mat_flow(mat)
File "/home/user1/test.py", line 60, in show_mat_flow
data = x['data']
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
File "/home/user1/.local/lib/python3.6/site-packages/h5py/_hl/group.py", line 264, in __getitem__
oid = h5o.open(self.id, self._e(name), lapl=self._lapl)
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper
File "h5py/h5o.pyx", line 190, in h5py.h5o.open
KeyError: "Unable to open object (object 'data' doesn't exist)"
原因:
暂时不是很确定原因。可能是mat文件保存时出了问题。建议numpy数组保存为mat文件时应使用 scipy.io.savemat，打开时应使用io.loadmat。这样一般不会出错。不建议和h5py.File交叉使用。
解决（仅供参考）：
保存mat文件之后用io.loadmat去检查是否保存正确。
重新运行生成mat文件的程序。以上报错的文件在matlab中打开时也会报错。
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