注意我的python的windows安裝目錄為：D:\Python37-32

python進行爬蟲時引用到BeautifuSoup開源的xml解析工具。以下為beautifulsoup4的windows的安裝步驟：

        首先去網站下載beautifulsoup壓縮包（beautifulsoup4-4.6.0.tar.gz）

                          https://www.crummy.com/software/BeautifulSoup/#Download

        將下載下來的壓縮包解壓後放入到python的安裝目錄(D:\Python37-32\beautifulsoup4-4.6.0)

        進入cmd，執行命令：

cd D:\Python37-32\beautifulsoup4-4.6.0
setup.py build
setup.py install

               在命令列輸入：python

               然後輸入：from bs4 import BeautifulSoup

      如果不出現任何提示資訊表示安裝成功。如果如下所示則安裝失敗，版本不相容

      在python3中引用BeautifuSoup4時會出現版本不相容的情況,具體看下面的錯誤程式碼

>>> from bs4 import BeautiulSoup
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "D:\Python37-32\beautifulsoup4-4.6.0\bs4\__init__.py", line 53
    'You are trying to run the Python 2 version of Beautiful Soup under Python 3. This will not work.'<>'You need to convert the code, either by installing it (`python setup.py install`) or by running 2to3 (`2to3 -w bs4`).'
                                                                                                       ^
SyntaxError: invalid syntax
 

        進入D:\Python37-32\Lib 目錄,並執行 2to3.py bs4 -w 命令

cd D:\Python37-32\Lib
2to3.py bs4 -w

      然後輸入 from bs4 import BeautifulSoup