Python Collection of problems seen by crawler ：
1. NotImplementedError: Only the following pseudo-classes are implemented:
nth-of-type
Answer:nth-child Change to nth-of-type
3.expected string or bytes-like object:
Answer: Code conversion .
eg:re.findall(r’’,html.decode(‘utf-8’))
4. 'gbk' codec can't encode character '\xa5' in position 184823: illegal
multibyte sequence
Answer:f = open(html,’w’,encoding = ‘utf-8’)
5. Web page garbled problem ： Chinese random code
Answer :response = requests.get(url,headers = header).content
#content Solve the garbled code
6. expected string or bytes-like object
Answer: Convert to string format ,str（urls）
urls = soup.select(' div > div.nei_left.fl > ul > li:nth-of-type(2)> a')[0]
Href = re.findall(r'<a href="(.*?)" target="" title=".*?">(.*?)</a>',str(urls))
7. Raise URLError (err) <urlopen error [Errno 11001] getaddrinfo failed>
usually ,URLError There is no network connection at ( There is no routing to a specific server ), Or when the server does not exist
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