NumPy 数组不是 JSON 可序列化的 [英] NumPy array is not JSON serializable

问题描述

创建 NumPy 数组并将其保存为 Django 上下文变量后，我在加载网页时收到以下错误:

After creating a NumPy array, and saving it as a Django context variable, I receive the following error when loading the webpage:

array([   0,  239,  479,  717,  952, 1192, 1432, 1667], dtype=int64) is not JSON serializable

这是什么意思?

推荐答案

我经常jsonify" np.arrays.首先尝试在数组上使用.tolist()"方法，如下所示:

I regularly "jsonify" np.arrays. Try using the ".tolist()" method on the arrays first, like this:

import numpy as np
import codecs, json 

a = np.arange(10).reshape(2,5) # a 2 by 5 array
b = a.tolist() # nested lists with same data, indices
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

为了unjsonify"数组使用:

In order to "unjsonify" the array use:

obj_text = codecs.open(file_path, 'r', encoding='utf-8').read()
b_new = json.loads(obj_text)
a_new = np.array(b_new)

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