mysql db연결이 왜 안될까요?

안녕하세요, 질 좋은강의를 해주셔서 정말 감사하고 많이배우고있습니다. 바쁘실테니 요점만 간단히 하겠습니다.

문제 : 이메일등록하려고 시도할때 DB연결이 안되있어서 @staticmethod인 find부터 걸림

체크해본것 :

mysql 데이터베이스, 테이블, 칼럼 확인 O

파라미터(user_email, blog_id) 잘넘어가는지 확인 O

import pymysql

MYSQL_CONN = pymysql.connect(
    host="localhost",
    port=3306,
    user='root',
    passwd='1234',
    db='blog_db',
    charset='utf8'
)


def conn_mysqldb():

    try:
        if not MYSQL_CONN.open:
            MYSQL_CONN.ping(reconnect=True)
        return MYSQL_CONN
    except Exception as e:
        print(e)


Traceback (most recent call last):
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask_cors/extension.py", line 165, in wrapped_function
    return cors_after_request(app.make_response(f(*args, **kwargs)))
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/_compat.py", line 39, in reraise
    raise value
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/joeykang/.conda/envs/Portfolio/lib/python3.8/site-packages/flask/app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/joeykang/PycharmProjects/Portfolio/portfolio_view/blog.py", line 23, in set_email
    user = User.create(user_email, blog_id)
  File "/Users/joeykang/PycharmProjects/Portfolio/portfolio_control/user_mgmt.py", line 50, in create
    user = User.find(user_email)
  File "/Users/joeykang/PycharmProjects/Portfolio/portfolio_control/user_mgmt.py", line 34, in find
    db_cursor = mysql_db.cursor()
AttributeError: 'function' object has no attribute 'cursor'