关于Json.Dumps 的使用和解决 Object of type XXX is not JSON serializable 错误

JSON是关于一种轻量级的数据交换格式。采用完全独立于编程语言的使用文本格式来存储和表示数据。简洁和清晰的和解层次结构使得 JSON 成为理想的数据交换语言。易于人阅读和编写，关于同时也易于机器解析和生成，使用并有效地提升网络传输效率。和解

json.dumps() 是关于把python对象转换成json对象的一个过程，源码下载生成的使用是字符串。

MyEncoder来自网上，和解将numpy的关于数据类型进行转换。

import numpy as np

import json

class MyEncoder(json.JSONEncoder):

def default(self,使用 obj):

if isinstance(obj, np.integer):

return int(obj)

elif isinstance(obj, np.floating):

return float(obj)

elif isinstance(obj, np.ndarray):

return obj.tolist()

else:

return super(MyEncoder, self).default(obj)

初始化数据，通过numpy构造随机数

# 初始化数据

monthstr=[str(x)+月 for x in range(1,和解 13)]

# [1月, 2月, 3月, 4月, 5月, 6月, 7月, 8月, 9月, 10月, 11月, 12月]

nphigh= np.random.randint(20,35,size=12)

# [21 32 30 27 34 25 27 30 26 22 30 22]

nplow=np.random.randint(5,20,size=12)

# [19 9 17 8 14 9 18 19 8 11 6 9]

Object of type ndarray is not JSON serializable错误以及解决办法

# ---------------error TypeError: Object of type ndarray is not JSON serializable--------------

# json.dumps({ month:monthstr,high:nphigh,low:nplow})

# ---------------solution 对np.integer，np.floating，关于np.ndarray进行转码

json.dumps({ month:monthstr,使用high:nphigh,low:nplow},cls=MyEncoder)

# { "month": ["1\u6708", "2\u6708", "3\u6708", "4\u6708", "5\u6708", "6\u6708", "7\u6708", "8\u6708", "9\u6708", "10\u6708", "11\u6708", "12\u6708"],

# "high": [32, 27, 28, 23, 24, 26, 29, 25, 24, 21, 31, 27],

# "low": [6, 17, 17, 6, 9, 15, 14, 18, 13, 11, 6, 5]}

# --------------------------------------------------------------

Object of type int32 is not JSON serializable错误以及解决办法，这里用到list()和tolist()方法，和解可以看出两者还是有明显不同。香港云服务器

# list()将外层转化为list类型，内层数据类型还是原始类型。

# tolist()方法将外层内层全转化为list类型。

# ---------------------------list()和tolist()差异化---------------------------------------------

# list()将外层转化为list类型，内层数据类型还是原始类型。

# tolist()方法将外层内层全转化为list类型。

high= list(nphigh)

low=list(nplow)

# # ---------------error TypeError: Object of type int32 is not JSON serializable--------------

# json.dumps({ month:monthstr,high:high,low:low})

# TypeError: Object of type int32 is not JSON serializable

# ---------------solution 对np.integer，np.floating，np.ndarray进行转码

json.dumps({ month:monthstr,high:high,low:low},cls=MyEncoder)

# { "month": ["1\u6708", "2\u6708", "3\u6708", "4\u6708", "5\u6708", "6\u6708", "7\u6708", "8\u6708", "9\u6708", "10\u6708", "11\u6708", "12\u6708"],

# "high": [33, 27, 34, 27, 29, 27, 27, 33, 33, 34, 29, 26],

# "low": [17, 19, 11, 13, 7, 6, 6, 7, 15, 5, 13, 19]}

# -----------------------------------------------------------------------------------------------

# tolist() 可正常使用

high= nphigh.tolist()

low=nplow.tolist()

json.dumps({ month:monthstr,high:high,low:low})

# { "month": ["1\u6708", "2\u6708", "3\u6708", "4\u6708", "5\u6708", "6\u6708", "7\u6708", "8\u6708", "9\u6708", "10\u6708", "11\u6708", "12\u6708"],

# "high": [29, 21, 22, 22, 31, 29, 21, 20, 32, 22, 20, 23],

# "low": [17, 19, 10, 9, 17, 8, 14, 16, 18, 13, 13, 10]}

正常列表的json.dumps使用方式

# 正常列表使用方法

high=[29, 33, 31, 20, 32, 32, 20, 25, 33, 20, 21, 27]

low=[8, 12, 17, 8, 6, 17, 8, 17, 14, 9, 8, 18]

json.dumps({ month:monthstr,high:high,low:low},ensure_ascii=False)

# { "month": ["1月", "2月", "3月", "4月", "5月", "6月", "7月", "8月", "9月", "10月", "11月", "12月"],

# "high": [29, 33, 31, 20, 32, 32, 20, 25, 33, 20, 21, 27],

# "low": [8, 12, 17, 8, 6, 17, 8, 17, 14, 9, 8, 18]}

json.dumps({ month:monthstr,high:high,low:low})

# { "month": ["1\u6708", "2\u6708", "3\u6708", "4\u6708", "5\u6708", "6\u6708", "7\u6708", "8\u6708", "9\u6708", "10\u6708", "11\u6708", "12\u6708"],

# "high": [29, 33, 31, 20, 32, 32, 20, 25, 33, 20, 21, 27],

# "low": [8, 12, 17, 8, 6, 17, 8, 17, 14, 9, 8, 18]}

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