python入门24 json模块

现在很多接口传参和响应都是json串。

json.dumps() python对象转化为json字符串

json.loads() json字符串转化为python对象。[]转变成list，{}转变成dict。

1 python对象转成json

'''2018-11-25 dinghanhua'''
import json

#python对象转化成json

dictdata = {'title':'python','page':100,'name': 'python development' }

print(dictdata)

print(type(dictdata))

jsonstr = json.dumps(dictdata) #转化为json

print(jsonstr)

print(type(jsonstr))

转换对应关系 false-False，true-True, object-dict, array - list, null-None

jsonstr = '{"array": [1,2,3], "bool": false, "null": null}'

data = json.loads(jsonstr)

print(data)

data = {'tuple': (1,2,3),'list': [1,2,3], 'bool': True, 'None': None}

jsonstr = json.dumps(data)

print(jsonstr)

排序、缩进格式化显示

jsonstr = json.dumps(dictdata,sort_keys=True) #排序

print(jsonstr)

jsonstr = json.dumps(dictdata,indent=4) #缩进显示

print(jsonstr)

是否转成ascii

dictdata2 = [{"count":168,"name":"前端开发","title":"前端开发"},{"count":94,"name":"编程","title":"编程"}]

print(dictdata2)

print(type(dictdata2))

jsonstr2 = json.dumps(dictdata2) #默认转成ascii

print(jsonstr2)

print(type(jsonstr2))

jsonstr2 = json.dumps(dictdata2,ensure_ascii=False)

print(jsonstr2)

print(type(jsonstr2))

2 json转成python对象

#json对象转化为python对象

jsonstr = '[{"count": 168, "name": "前端开发", "title": "前端开发"}, {"count": 94, "name": "编程", "title": "编程"}]'

data = json.loads(jsonstr)

print(data)

print(type(data))

3 转成json写入文件；从文件读json转成python对象

#转化成json写入文件

data = [{'count': 168, 'name': '前端开发', 'title': '前端开发'}, {'count': 94, 'name': '编程', 'title': '编程'}]

with open('1.json','w') as f:

    json.dump(data,f,indent=4,ensure_ascii=False)

#从文件读取json转成python对象

with open('1.json','r') as f:

    data = json.load(f)

    print(data)

    print(type(data))

官网：https://docs.python.org/3/library/json.html

巴特西

python入门24 json模块

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