用Flask-SQLAlchemy+mysql插入中文，再查询返回时报错

UnicodeEncodeError: 'ascii' codec can't encode characters in position 44-46: ordinal not in range(128)

# -*- coding: utf-8 -*-
from flask import Flask
from sqlalchemy import create_engine
from flask.ext.sqlalchemy import SQLAlchemy
from datetime import datetime
from sqlalchemy.orm import scoped_session, sessionmaker
import config
import os  
basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = config.DB_URI
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = True
db = SQLAlchemy(app,use_native_unicode='utf8')

class Role(db.Model):
    __tablename__ = 'roles'
    id = db.Column(db.Integer, primary_key=True) 
    name = db.Column(db.String(64), unique=True)

    def __repr__(self):
        return '<Role %r>' % self.name
    
print(config.DB_URI)     
print(Role.query.all())

数据库status已经全部设置成utf8，表也是utf8 在role的表中已经有中文数据 但不知道如何是好，还是报错

用的是python3

mysql status:

error: