I can't import flask_mysqldb in python3.6 got error invalid syntax

Question

when I enter python3.6 123.py in terminal, I got the error

Traceback (most recent call last):
  File "123.py", line 2, in <module>
    import flask_mysqldb
  File "/usr/local/lib/python3.6/site-packages/flask_mysqldb/__init__.py", line 2, in <module>
    import MySQLdb.cursors
  File "/usr/local/lib/python3.6/site-packages/MySQLdb/cursors.py", line 191
    except TypeError, m:
                    ^
SyntaxError: invalid syntax

My code:

# -*- coding: UTF-8 -*-
import flask_mysqldb

I don't know what I miss. I am following this link to install https://pypi.org/project/Flask-MySQLdb/