我是python的新手，对下面的代码有麻烦。我正在尝试获取温度或网站上的日期，但似乎无法获得输出。我尝试了许多变体，但似乎仍然无法正确完成。
谢谢您的帮助！
#Code below:
import requests,bs4
r = requests.get('http://www.hko.gov.hk/contente.htm')
print r.raise_for_status()
hkweather = bs4.BeautifulSoup(r.text)
print hkweather.select('div left_content fnd_day fnd_date')
您的css选择器不正确，您应该.在标记和css类之间使用，想要的标记位于div中，且fnd_day该类位于div内，且ID为fnd_content
divs = soup.select("#fnd_content div.fnd_day")
但这仍然无法获取数据，因为它是通过ajax请求动态生成的，您可以使用以下代码以json格式获取所有数据：
u = "http://www.hko.gov.hk/wxinfo/json/one_json.xml?_=1468955579991"
data = requests.get(u).json()
from pprint import pprint as pp
pp(data)
这几乎返回了所有动态内容，包括日期和时间等。
如果访问键F9D，则可以看到有关所有临时性和日期的一般天气描述：
from pprint import pprint as pp
pp(data['F9D'])
输出：
{'BulletinDate': '20160720',
'BulletinTime': '0315',
'GeneralSituation': 'A southwesterly airstream will bring showers to the '
'coast of Guangdong today. Under the dominance of an '
'upper-air anticyclone, it will be generally fine and '
'very hot over southern China in the latter part of this '
'week and early next week.',
'NPTemp': '25',
'WeatherForecast': [{'ForecastDate': '20160720',
'ForecastIcon': 'pic53.png',
'ForecastMaxrh': '95',
'ForecastMaxtemp': '32',
'ForecastMinrh': '70',
'ForecastMintemp': '26',
'ForecastWeather': 'Sunny periods and a few showers. '
'Isolated squally thunderstorms at '
'first.',
'ForecastWind': 'South to southwest force 4.',
'IconDesc': 'Sunny Periods with A Few Showers',
'WeekDay': '3'},
{'ForecastDate': '20160721',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '28',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'South to southwest force 3 to 4.',
'IconDesc': 'Hot',
'WeekDay': '4'},
{'ForecastDate': '20160722',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '28',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'Southwest force 3.',
'IconDesc': 'Hot',
'WeekDay': '5'},
{'ForecastDate': '20160723',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '34',
'ForecastMinrh': '65',
'ForecastMintemp': '29',
'ForecastWeather': 'Fine and very hot.',
'ForecastWind': 'Southwest force 3.',
'IconDesc': 'Hot',
'WeekDay': '6'},
{'ForecastDate': '20160724',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '34',
'ForecastMinrh': '65',
'ForecastMintemp': '29',
'ForecastWeather': 'Fine and very hot.',
'ForecastWind': 'Southwest force 3.',
'IconDesc': 'Hot',
'WeekDay': '0'},
{'ForecastDate': '20160725',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '29',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'South to southwest force 3.',
'IconDesc': 'Hot',
'WeekDay': '1'},
{'ForecastDate': '20160726',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '29',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'South to southwest force 3.',
'IconDesc': 'Hot',
'WeekDay': '2'},
{'ForecastDate': '20160727',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '28',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'Southwest force 3 to 4.',
'IconDesc': 'Hot',
'WeekDay': '3'},
{'ForecastDate': '20160728',
'ForecastIcon': 'pic90.png',
'ForecastMaxrh': '90',
'ForecastMaxtemp': '33',
'ForecastMinrh': '65',
'ForecastMintemp': '28',
'ForecastWeather': 'Mainly fine and very hot apart from '
'isolated showers in the morning.',
'ForecastWind': 'Southwest force 3 to 4.',
'IconDesc': 'Hot',
'WeekDay': '4'}]}
唯一的查询字符串参数是可以使用时间lib生成的纪元时间戳：
from time import time
u = "http://www.hko.gov.hk/wxinfo/json/one_json.xml?_={}".format(int(time()))
data = requests.get(u).json()
不传递时间戳也会返回相同的数据，因此我将留给您调查其重要性。
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