python 错误问题解决

获取天气信息

#encoding:UTF-8
import urllib.request
import re
def getHtml(url):
    page=urllib.request.urlopen(url)
    html=page.read()

    page.close()
    return html.decode('UTF-8')
def getWeather(html):
    reg='<a href=(.*?)>*</a>'
    weatherList=re.compile(reg).findall(html)
    return weatherList
weatherList=getWeather(getHtml('http://gd.weather.com.cn/'))
for weather in weatherList:
    print (weather) 

常见问题：

1. TypeError: can't use a string pattern on a bytes-like object

解决： python3中urllib.read返回的是bytes对象，　　不是string,得把它转换成string对象，用bytes.decode方法