报错：

from . import connections  # noqa: 
E402 
E     File "/home/ubuntu/.local/lib/python3.5/site-packages/pymysql/connections.py", line 206 
E       ): 
E       ^ E   SyntaxError: invalid syntax

原因：

安装的pymysql版本与python3.5版本不匹配

解决：

pip uninstall pymysql
pip install -Iv pymysql==0.9.3