Read/write json of numpy array

rw_numpy_json.py

import numpy as np
import codecs, json 

#In order ot store an numpy array as a .json file
a = np.arange(10).reshape(2,5) # a 2 by 5 array
b = a.tolist() # nested lists with same data, indices
#    Obviously, if you already have list, you don't/can't .tolist() it
file_path = "/path.json" ## your path variable
json.dump(b, codecs.open(file_path, 'w', encoding='utf-8'), separators=(',', ':'), sort_keys=True, indent=4) ### this saves the array in .json format

#In order to "unjsonify" the array use:
obj_text = codecs.open(file_path, 'r', encoding='utf-8').read()
b_new = json.loads(obj_text) #This reads json to list
a_new = np.array(b_new)      #This converts to numpy