A、urllib
import urllib
import urllib.request
import json

'''
1、loads，dumps
json.loads():将字符串转化成python的基础数据类型（字符换===》列表字典元祖，字典中必须是“”）
json.dumps():将python的python基本数据类型转化成字符串（列表，字典===》字符串）
'''
s='{"status":1000,"desc":"OK"}'   #里面的值必须是双引号

result=json.loads(s)         #将一个形似字典，列表，元祖的字符串转化成字典或者列表，元祖
print(result,type(result))

s1=json.dumps(result)
print (s1,type(s1))
----------------------------------------------------

　　{'status': 1000, 'desc': 'OK'} <class 'dict'>
　　{"status": 1000, "desc": "OK"} <class 'str'>

----------------------------------------------------

'''
2、dump，load
json.dump()：
json.load()
'''
s2=urllib.request.Request("http://www.weather.com.cn/adat/sk/101050101.html")
r=urllib.request.urlopen(s2)
result=str(r.read(),encoding="utf8")
print (result,type(result))
res=json.loads(result)
print (res,type(res))
----------------------------------------------------

{"weatherinfo":{"city":"哈尔滨","cityid":"101050101","temp":"5","WD":"南风","WS":"3级","SD":"31%","WSE":"3","time":"10:00","isRadar":"1","Radar":"JC_RADAR_AZ9451_JB","njd":"暂无实况","qy":"999"}} <class 'str'>
   {'weatherinfo': {'city': '哈尔滨', 'cityid': '101050101', 'temp': '5', 'WD': '南风', 'WS': '3级', 'SD': '31%', 'WSE': '3', 'time': '10:00', 'isRadar': '1', 'Radar': 'JC_RADAR_AZ9451_JB', 'njd': '暂无实况', 'qy': '999'}} <class 'dict'>

----------------------------------------------------
'''
3、requests:第三方包
'''
import requests

response=requests.get("http://www.weather.com.cn/adat/sk/101050101.html")
response.encoding="utf-8"
result=response.text
#result=response.content
print (result,type(result))
------------------------------------------------------------

{"weatherinfo":{"city":"哈尔滨","cityid":"101050101","temp":"5","WD":"南风","WS":"3级","SD":"31%","WSE":"3","time":"10:00","isRadar":"1","Radar":"JC_RADAR_AZ9451_JB","njd":"暂无实况","qy":"999"}} <class 'str'>

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print("-------------------------------------------------------------------------------------")