实例：抓取全国天气信息

• 说明

• urllib + json

# 全国主要城市
city_list = [
    # 华北
    {"北京": "101010100"},
    {"天津": "101030100"},
    {"石家庄": "101090101"},
    {"太原": "101100101"},
    {"呼和浩特": "101080101"},
    {"保定": "101090201"},
    {"大同": "101100201"},
    {"包头": "101080201"},
    {"承德市": "101090402"},
    {"晋中": "101100401"},
    {"通辽": "101080501"},
    {"秦皇岛": "101091101"},
    # 东北
    {"哈尔滨": "101050101"},
    {"长春": "101060101"},
    {"沈阳": "101070101"},
    {"齐齐哈尔": "101050201"},
    {"吉林": "101060201"},
    {"大连": "101070201"},
    {"牡丹江": "101050301"},
    {"延吉": "101060301"},
    {"鞍山": "101070301"},
    {"绥化": "101050501"},
    {"白城": "101060601"},
    {"葫芦岛": "101071401"},
    # 华南
    {"广州": "101280101"},
    {"南宁": "101300101"},
    {"海口": "101310101"},
    {"香港": "101320101"},
    {"澳门": "101330101"},
    {"深圳": "101280601"},
    {"桂林": "101300501"},
    {"三亚": "101310201"},
    {"珠海": "101280701"},
    {"中山": "101281701"},
    {"百色": "101301001"},
    {"万宁": "101310215"},
    # 西北
    {"西安": "101110101"},
    {"兰州": "101160101"},
    {"西宁": "101150101"},
    {"银川": "101170101"},
    {"乌鲁木齐": "101130101"},
    {"延安": "101110300"},
    {"宝鸡": "101110901"},
    {"天水": "101160901"},
    {"吴忠": "101170301"},
    {"吐鲁番": "101130501"},
    {"酒泉": "101160801"},
    {"固原": "101170401"},
    # 西南
    {"重庆": "101040100"},
    {"成都": "101270101"},
    {"贵阳": "101260101"},
    {"昆明": "101290101"},
    {"拉萨": "101140101"},
    {"绵阳": "101270401"},
    {"遵义": "101260201"},
    {"大理": "101290201"},
    {"乐山": "101271401"},
    {"六盘水": "101260801"},
    {"丽江": "101291401"},
    # 华东
    {"上海": "101020100"},
    {"福州": "101230101"},
    {"合肥": "101220101"},
    {"南昌": "101240101"},
    {"济南": "101120101"},
    {"嘉兴": "101210301"},
    {"南京": "101190101"},
    {"宁波": "101210401"},
    {"杭州": "101210101"},
    {"苏州": "101190401"},
    {"青岛": "101120201"},
    {"厦门": "101230201"},
    {"台北市": "101340101"},
    # 华中
    {"郑州": "101180101"},
    {"武汉": "101200101"},
    {"长沙": "101250101"},
    {"安阳": "101180201"},
    {"襄阳": "101200201"},
    {"湘潭": "101250201"},
    {"株洲": "101250301"},
    {"许昌": "101180401"},
    {"常德": "101250601"},
    {"张家界": "101251101"},
    {"孝感": "101200401"},
    {"荆门": "101201401"}
]

    text = get_html_text('http://www.weather.com.cn/data/sk/101200401.html')
    obj = json.loads(text)
    weather = obj["weatherinfo"]
    print("城市:"+weather["city"])
    print("温度:" + weather["temp"])
    print("风向:" + weather["WD"])
    print("风力:" + weather["WS"])
    print("湿度:" + weather["SD"])
    print("气压:" + weather["AP"])
    print("发布时间："+weather["time"])

1. 如何把字符串转成JSON对象？

json.loads(字符串)

同理可以把JSON对象转成字符串

json.dumps(JSON对象)

把JSON对象当作字典对象使用。