python，Windows环境安装及导入beautifulsoup

1、执行命令：pip install beautifulsoup4，安装

2、使用时导入BeautifulSoup

3.0以及3.0以下版本，导入语句为：

from BeautifulSoup import BeautifulSoup          # For processing HTML
from BeautifulSoup import BeautifulStoneSoup     # For processing XML
import BeautifulSoup                             # To get everything

4.0版本导入语句为：

from bs4 import BeautifulSoup # To get everything