python程序, 實現matlab的.mat格式轉化為dict / json .

第一個參數mat_path代表需要轉化的mat路徑;

第二個參數, 如果需要把字典序列化成json, 添加這一參數, 代表json存放位置;

返回值: 轉化好的字典

import os

import json

import scipy.io as spio

import pandas as pd

def loadmat(filename):

'''

this function should be called instead of direct spio.loadmat

as it cures the problem of not properly recovering python dictionaries

from mat files. It calls the function check keys to cure all entries

which are still mat-objects

'''

data = spio.loadmat(filename, struct_as_record=False, squeeze_me=True)

return _check_keys(data)

def _check_keys(dict):

'''

checks if entries in dictionary are mat-objects. If yes

todict is called to change them to nested dictionaries

'''

for key in dict:

if isinstance(dict[key], spio.matlab.mio5_params.mat_struct):

dict[key] = _todict(dict[key])

return dict

def _todict(matobj):

'''

A recursive function which constructs from matobjects nested dictionaries

'''

dict = {}

for strg in matobj._fieldnames:

elem = matobj.__dict__[strg]

if isinstance(elem, spio.matlab.mio5_params.mat_struct):

dict[strg] = _todict(elem)

else:

dict[strg] = elem

return dict

def mat2json(mat_path=None, filepath = None):

"""

Converts .mat file to .json and writes new file

Parameters

----------

mat_path: Str

path/filename .mat存放路徑

filepath: Str

如果需要保存成json, 添加這一路徑. 否則不保存

Returns

返回轉化的字典

-------

None

Examples

--------

>>> mat2json(blah blah)

"""

matlabFile = loadmat(mat_path)

#pop all those dumb fields that don't let you jsonize file

matlabFile.pop('__header__')

matlabFile.pop('__version__')

matlabFile.pop('__globals__')

#jsonize the file - orientation is 'index'

matlabFile = pd.Series(matlabFile).to_json()

if filepath:

json_path = os.path.splitext(os.path.split(mat_path)[1])[0] + '.json'

with open(json_path, 'w') as f:

f.write(matlabFile)

return matlabFile

總結

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