1.ASCII（一个字节代表一个）是一种UTF8（动态的1-4字节代表一个）
2. 使用urllib请求网址后，就可以当作普通文件一样操作
***记得decode()
3.课后作业3：PY4E - Python for EverybodyPY4E - Python for EverybodyPY4E - Python for Everybody
题目：In this assignment you will write a Python program that expands on?http://www.py4e.com/code3/urllinks.py. The program will use?urllib?to read the HTML from the data files below, extract the href= vaues from the anchor tags, scan for a tag that is in a particular position relative to the first name in the list, follow that link and repeat the process a number of times and report the last name you find.
使用re获取网址结果超时timeout..
获取soup中所有锚点tags获得一个数组，直接使用[num]就可以调用第num项！
# To run this, download the BeautifulSoup zip file
# http://www.py4e.com/code3/bs4.zip
# and unzip it in the same directory as this file
import urllib.request, urllib.parse, urllib.error
from bs4 import BeautifulSoup
import ssl
import re
# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE
count = 7
url = 'http://py4e-data.dr-chuck.net/known_by_Kayam.html'
for i in range(count):
html = urllib.request.urlopen(url, context=ctx).read()
soup = BeautifulSoup(html, 'html.parser')
tags = soup('a')
#url = re.findall('h.*html',tags[2].get('href', None))
url = tags[17].get('href',None)
print(url)
运行结果：
*Monty为我的正确答案（每个人不一样）
