无法在python3上导入pymysql，引发导入错误

Question

在Debian机器上的venv上无法导入python-3.6中的pymysl尝试了所有可能的选项。安装时未出现任何错误。

sudo apt-get update
sudo apt-get install python3-pip
sudo apt-get install python-dev default-libmysqlclient-dev
sudo apt-get install python3-dev
sudo pip3  install mysqlclient
sudo apt-get install python3-pymysql
sudo apt-get install python3.6-dev libmysqlclient-dev
sudo pip3 install pymysql
sudo pip3  install mysql-connector-python