Python Web-第六周-JSON and the REST Architecture（Using Python to Access Web Data）

1.JavaScript Object Notation JSON

1.JSON 官方介绍 http://www.json.org/json-zh.html

2.json1.py

import json
data='''
{
"name":"Chuck",
"phone":
{
"type":"intl",
"number":"+1231231234"
},
"email":
{
"hide":"yes"
}
}'''
info =json.loads(data)
print'Name:',info["name"]
print'Hide:',info["email"]["hide"]

JSON represents data as nested “lists”and “dictionaries”

JOSN数据表现为嵌套的“列表”和“字典”

而XML数据表现为树

3.josn2.py

import json
input='''
[
{
"id":"001",
"x":"2",
"name":"dch"
},
{
"id":"007",
"x":"7",
"name":"zxc"
}
]'''
info =json.loads(input)#deserialize
print'User count:',len(info)
for item in info:
print'Name:',item['name']
print'Id:',item['id']
print'X:',item['x']

2.Service Oriented Approach SOA 服务导向架构

1.什么是SOA

SOA是一种架构模型，由网站服务技术等标准化组件组成，

目的是为企业、学校或提供网络服务单位建构一个具弹性、可重复使用的整合性接口，

促进内外部应用程序、用户、与部门等的沟通，提升网络服务。

3.Accessing APIs in Python

1.API Application Program Interface

2.Web Service Technologies

3.Google Geocoding

http://maps.googleapis.com/maps/api/geocode/json?sensor=false&address=Ann+Arbor%2C+MI

{
"results":[
{
"address_components":[
{
"long_name":"安娜堡",
"short_name":"安娜堡",
"types":["locality","political"]
},
{
"long_name":"沃什特瑙郡",
"short_name":"沃什特瑙郡",
"types":["administrative_area_level_2","political"]
},
{
"long_name":"密歇根州",
"short_name":"MI",
"types":["administrative_area_level_1","political"]
},
{
"long_name":"美国",
"short_name":"US",
"types":["country","political"]
}
],
"formatted_address":"美国密歇根州安娜堡",
"geometry":{
"bounds":{
"northeast":{
"lat":42.3239728,
"lng":-83.6758069
},
"southwest":{
"lat":42.222668,
"lng":-83.799572
}
},
"location":{
"lat":42.2808256,
"lng":-83.7430378
},
"location_type":"APPROXIMATE",
"viewport":{
"northeast":{
"lat":42.3239728,
"lng":-83.6758069
},
"southwest":{
"lat":42.222668,
"lng":-83.799572
}
}
},
"place_id":"ChIJMx9D1A2wPIgR4rXIhkb5Cds",
"types":["locality","political"]
}
],
"status":"OK"
}

geojson.py

import urllib
import json
serviceurl ='http://maps.googleapis.com/maps/api/geocode/json?'
#http://maps.googleapis.com/maps/api/geocode/json?sensor=false&address=Ann+Arbor%2C+MI
whileTrue:
address = raw_input('Enter location: ')
if len(address)<1:break
url = serviceurl + urllib.urlencode({'sensor':'false','address': address})
print'Retrieving', url
# file method successd
my_file=open("C:\Users\DUANCHENGHUA\Desktop\json","r")
data=my_file.read()
# url method failed open
'''
uh = urllib.urlopen('http://maps.googleapis.com/maps/api/geocode/json?sensor=false&address=ChongQing%2CChina')
data = uh.read()
'''
try: js = json.loads(str(data))
except: js =None
if'status'notin js or js['status']!='OK':
print'==== Failure To Retrieve ===='
print data
continue
print json.dumps(js, indent=4)
lat = js["results"][0]["geometry"]["location"]["lat"]
lng = js["results"][0]["geometry"]["location"]["lng"]
print'lat',lat,'lng',lng
location = js['results'][0]['formatted_address']
print location