python爬虫之有道翻译小demo

有道翻译的post请求的url地址：

http://fanyi.youdao.com/translate_o?

smartresult=dict&smartresult=rule

http://fanyi.youdao.com/translate?

smartresult=dict&smartresult=rule&smartresult=ugc&sessionFrom=null

    from urllib import parse,request
    import json

    url = 'http://fanyi.youdao.com/translate?                  smartresult=dict&smartresult=rule&smartresult=ugc&sessionFrom=null'

    formdata = {
        'i': '我的祖国',
        'from': 'AUTO',
        'to': 'AUTO',
        'smartresult': 'dict',
        'client': 'fanyideskweb',
        'doctype': 'json',
        'version': '2.1',
        'keyfrom': 'fanyi.web',
        'action': 'FY_BY_CLICKBUTTION',
        'typoResult': 'false',
    }

    formdata = parse.urlencode(formdata).encode('utf-8')

    req_header = {
        'User-Agent':'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36',
    }

    req = request.Request(url,headers=req_header,data=formdata)

    response = request.urlopen(req)

    print(response.status)
    # print(response.read().decode('utf-8'))
    json_str = response.read().decode('utf-8')
    print(json_str)

    # json.loads():将json字符串,转换为python的数据类型；
    # json类型的数据（对象和数组）对象－＞dict 数组->list
    # json.load()
    # json.dumps()
    # json.dump()
    """
    {
    "type":
    "ZH_CN2EN",
    "errorCode":0,
    "elapsedTime":23,
    "translateResult":
        [
            [
                {"src":"我的祖国","tgt":"My motherland"}
            ]
        ]
    }

    """
    #{"name":"xxx","age":18,"info":["1","2","3"]}

    data = json.loads(json_str)
    print(type(data))

    result = data['translateResult'][0][0]['tgt']
    print(result)