爬蟲小案例：輸入電影名稱獲取資源下載鏈接

需求：用戶輸入喜歡的電影名字，程序即可在電影天堂https://www.ygdy8.com爬取電影所對應的下載鏈接，並將下載鏈接打印出來

import requests
from bs4 import BeautifulSoup
from urllib.request import pathname2url

# 為躲避反爬機制，偽裝成瀏覽器的請求頭
headers = {'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36 OPR/65.0.3467.78 (Edition Baidu)'}

# 獲取電影磁力鏈接
def getMovieDownloadLink(filmlink):
    res = requests.get(filmlink, headers=headers)
    if res.status_code == 200:

        # 請求后的內容中文亂碼處理辦法：
        # 當response編碼是‘ISO-8859-1’，我們應該首先查找response header設置的編碼；如果此編碼不存在，查看返回的Html的header設置的編碼
        if res.encoding == 'ISO-8859-1':
            encodings = requests.utils.get_encodings_from_content(res.text)
            if encodings:
                encoding = encodings[0]
            else:
                encoding = res.apparent_encoding
        else:
            encoding = res.encoding
        encode_content = res.content.decode(encoding, 'replace').encode('utf-8', 'replace')

        soup = BeautifulSoup(encode_content, 'html.parser')
        Zoom = soup.select_one('#Zoom')
        fileurl = Zoom.find('table').find('a').text
        with open('./17-電影天堂磁力.txt','a', newline='') as file:
            file.write(fileurl + '\n')

    else:
        print('電影鏈接：{}請求失敗！'.format(filmlink))

def main():
    dyurl = 'https://www.ygdy8.com'
    movie = input('請輸入電影名稱：')
    # movie = '沉睡魔咒'
    movie = movie.encode('gbk')
    url = 'http://s.ygdy8.com/plus/s0.php?typeid=1&keyword={0}'.format(pathname2url(movie))
    res = requests.get(url, headers=headers)
    if res.status_code == 200:
        htmltext = res.text
        soup = BeautifulSoup(htmltext, 'html.parser')
        co_content8 = soup.find('div', class_='co_content8')
        tables = co_content8.find('ul').find_all('table')
        if len(tables) <= 0:
            print('沒有找到相關的資源，可到站點上搜索 {0}'.format(dyurl))
        else:
            for table in tables:
                filmlink = dyurl + table.find('a')['href']
                getMovieDownloadLink(filmlink)

    else:
        print('請求失敗！')

main()