python3.7导入BeautifulSoup报错

之前使用python2.7时，PyCharm用快捷键Alt+Enter就可以轻松导入BeautifulSoup；但是将项目解释器变为python3.7后，需要导入BeautifulSoup4

python2.7导入BeautifulSoup

当python版本为2.7时，使用BeautifulSoup时，在PyCharm中使用快捷键Alt+Eneter，自动导入成功from bs4 import BeautifulSoup

将pycharm的项目解释器由python2.7更换为python3.7，BeautifulSoup包报错

1、将PyCharm的项目解释器由python2.7更换为python3.7
PyCharm -> preferences -> Project Interpreter -> Python 3.7
2、运行，报错：ModuleNotFoundError: No module named ‘bs4’
3、在PyCharm中使用快捷键Alt+Eneter：Install Package BeautifulSoup
安装失败，点开详细：SyntaxError: Missing parentheses in call to ‘print’. Did you mean print(“Unit tests have failed!”)?
4、尝试另一种方式安装BeautifulSoup：
PyCharm -> preferences -> Project Interpreter -> Python 3.7 点击左下角+，Install beautifulsoup4，勾选Install to user’s site packages directory，点击Install Package


5、发现Beautifulsoup4已经安装成功，点击OK
6、再次运行，发现已经OK